CN106370604B - Human body test method for cleaning capability of cleaning product to sun-proof product - Google Patents
Human body test method for cleaning capability of cleaning product to sun-proof product Download PDFInfo
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- CN106370604B CN106370604B CN201610865261.9A CN201610865261A CN106370604B CN 106370604 B CN106370604 B CN 106370604B CN 201610865261 A CN201610865261 A CN 201610865261A CN 106370604 B CN106370604 B CN 106370604B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
Abstract
Discloses a method for testing the residual quantity of skin of a cosmetic sunscreen product, which comprises the following steps: (i) ultraviolet photographing an area of skin of a human body to be tested and reading light intensity data a of the area on the ultraviolet photographing0(ii) a (ii) Applying the sunscreen product under test to the human skin to form an application area; (iii) cleaning the coated area with a cleaning product, UV-photographing the cleaned area and reading the light intensity data a of the area on the UV-photograph1(ii) a And (iv) calculating the clean area intensity change rate Δ as an indicator of skin residue of the sunscreen product according to the following formula: Δ ═ a0‑a1)/a0。
Description
Technical Field
The present invention relates to the field of cosmetics. In particular to a method for evaluating the cleaning capability of a cleaning product on a sun-screening product by measuring the skin residual quantity of the sun-screening product.
Background
In addition to visible light, about 1% of sunlight can be irradiated with ultraviolet rays having a wavelength of 280 to 400 nm. The ultraviolet ray is divided into 3 bands, wherein UVA (320-400 nm) and UVB (280-320 nm) are mainly used for damaging skin. Prolonged exposure of the skin to ultraviolet light can lead to photoaging; short-term, high intensity uv irradiation can also cause acute damage to the skin, with UVB primarily causing erythema and UVA primarily causing skin darkening. In order to protect the skin from the damage of ultraviolet rays in sunlight, products with a sun-screening function are also becoming one of important products in the cosmetic industry, and common products comprise sun-screening products, day cream products, BB cream and CC cream with functions of concealing and repairing the face, and the like.
Sunscreen products on the one hand act to modify and protect the skin and on the other hand block the pores of the skin if they remain on the skin, leaving the skin unable to breathe. For sunscreen products, physical sunscreens and chemical sunscreens are generally added for having a sunscreen function, the physical sunscreens are generally not absorbed by skin, are safe and nontoxic, but have obvious sticky feeling if not removed completely; chemical sunscreens are potentially irritating to the skin at certain concentrations and are therefore generally limited in their use in sunscreen products, although their use in sunscreen products is within safe limits, because they are insoluble in water, if they cannot be removed during daily use, the amount of residual sunscreen remaining on the skin over the course of a daily period of time exceeds the safe concentration range and can cause damage to the skin.
Thus, if the make-up and sunscreen product is used during the day, it must be removed at night. In the case of water-resistant sunscreen products, which are difficult to remove with water alone, it is necessary to treat them with special make-up removal products so that they do not leave residues on the skin.
What criteria to decide whether to remove the clean? Since color cosmetics are generally colored, consumers can judge the color cosmetics through the observation of naked eyes; however, after the sunscreen product is applied on the skin, no obvious color is generated, although the sunscreen product has obvious sticky feeling after being applied, the sticky feeling is a subjective sensory index, and the sunscreen product is difficult to objectify and quantify.
Ultraviolet reflectance photography is commonly used in criminal investigation for, for example, sweat fingerprinting of the surface of an extract. Ba xi et al in "digital camera-Long wave ultraviolet reflectance photography technical research" ("criminal police techniques", see the netbook) text defines ultraviolet reflectance photography as: ultraviolet reflection photography is a photographic technique in which an object to be inspected is irradiated with ultraviolet rays, and the difference in the reflection and absorption of the ultraviolet rays by a substance is utilized to increase the difference in brightness between a trace and a carrier, thereby recording the distribution of the ultraviolet rays reflected by the object on a photosensitive material.
Chinese patent application CN105427306A to buddlei et al discloses an image analysis method and apparatus for skin glossiness, which includes collecting digital images of a subject's skin under the same light source conditions, calculating the frequency distribution of pixels, setting the extraction conditions of highlight portions, and calculating the pixel proportion of highlight portions extracted according to the extraction conditions as an index of skin glossiness. However, the patent document does not mention how to determine the performance of sunscreen products.
Therefore, there is a need to provide a method for measuring the residual amount of sunscreen product on the skin in order to evaluate the cleaning ability of the cleaning product in the cosmetic field.
Disclosure of Invention
It is an object of the present invention to provide a method for evaluating the cleaning ability of a cleaning product to a sunscreen by measuring the residual amount of the sunscreen on the skin.
Accordingly, the present invention provides a method for testing the skin residual amount of a cosmetic sunscreen product, comprising the steps of:
(i) ultraviolet photographing an area of skin of a human body to be tested and reading light intensity data a of the area on the ultraviolet photographing0；
(ii) Applying the sunscreen product under test to the human skin to form an application area;
(iii) cleaning the coated area with a cleaning product, UV-photographing the cleaned area and reading the light intensity data a of the area on the UV-photograph1(ii) a And
(iv) calculating the light intensity change rate delta of the cleaning area according to the following formula as an index of the skin residue of the sunscreen product:
Δ＝(a0-a1)/a0。
in one embodiment of the present invention, the testing method further comprises the steps of:
(v) smearing a series of sunscreen products with unit area coating amount in a test area, photographing before and after smearing, calculating light intensity and change rate before and after smearing, and correspondingly obtaining a series of light intensity change rates deltaiAnd the rate of change of the coating amount per unit area to the light intensity isiPlotting as a standard curve;
(vi) and (3) converting the light intensity change rate delta of the step (iv) into the unit area residual quantity of the sunscreen product according to the obtained standard curve, and calculating the removal rate r according to the following formula:
r-1-residual amount/initial application amount.
In addition, the invention also provides the use of the ultraviolet image analysis method for evaluating the cleaning capability of the cleaning product on the sun-proof product.
Drawings
The invention is further described below with reference to the accompanying drawings. In the drawings:
FIG. 1 is a UV image of a human arm before and after a preferred embodiment of the present invention has been applied with a sunscreen product and after washing with a cleaning product to illustrate the flow of the test method of the present invention;
FIG. 2 is a standard curve of the amount of sunscreen applied per unit area (or residue) versus the rate of change of light intensity obtained using the method of the present invention.
Detailed Description
The inventors have found that the intensity of light irradiated with ultraviolet radiation after application of the sunscreen product to the skin is significantly reduced, whereas the intensity of light irradiated with ultraviolet radiation after washing with a cleaning product is significantly increased if the sunscreen product can be removed. Based on the findings, the inventor proposes that the removal capacity of the sunscreen product is expressed according to the light intensity change obtained by ultraviolet irradiation before and after the sunscreen product is smeared and before and after the sunscreen product is cleaned by the cleaning product, so that the human body test method for the cleaning capacity of the sunscreen product by the cleaning product, which is simple, convenient and feasible, does not cause damage to the skin, is provided.
Figure 1 is a uv image of a human arm before and after application of a sunscreen product and after washing. As shown in fig. 1, the uv photo intensity in the same area of the arm was significantly reduced after application of the sunscreen product, while the intensity was increased after washing with the cleaning product. The present invention can readily assess the cleaning ability of a cleaning product to a sunscreen product by measuring this change in light intensity (or the amount of residual skin of the sunscreen product after cleaning).
The invention provides a human body test method for the cleaning capability of a beauty cleaning product on a sunscreen product. Suitable sunscreen products for use in the method of the present invention may be any cosmetic skin care product containing sunscreen agents or having sunscreen and anti-uv functions, such as, by way of non-limiting example, sunscreens, sunblocks, sun creams and the like.
The invention adopts an ultraviolet photography method to evaluate the sun-screening performance of the sun-screening agent product. The UV photography process is known per se. For example, Ba xi et al, in "digital camera-long wave ultraviolet reflection photography technique research" ("criminal police technique", see the web) mention ultraviolet reflection photography. The inventor of the invention finds that the cleaning capability of a cleaning product on a product containing a sun-screening agent can be evaluated by adopting an ultraviolet reflection photography method, and the method is safe, quick and low in cost.
The method of the present invention comprises blank uv photography of an area of human skin to be tested. The requirements for the selected tested human skin are the same as the requirements for the human skin area by a human evaluation method in 'cosmetic hygiene code' (2007), namely, the selected tested human skin area is required to be a healthy male or female volunteer subject of 18-60 years old, the subject has no history of photosensitive diseases and does not use drugs influencing the photosensitivity in the near future, the skin of the tested part has no pigmentation, inflammation, scar, pigmented nevus, hairy and the like, and the subject is excluded from anti-inflammatory drugs such as corticosteroid hormone for pregnancy, lactation, oral administration or external use, or similar subjects received in the near month.
The ultraviolet photography method used is a known ultraviolet photography method, and for example, the ultraviolet reflection photography method is mentioned in "digital camera-long wave ultraviolet reflection photography technical research" by baxi et al (criminal police technology, see gay). Ultraviolet photography equipment is commercially available, for example, from the American Canfield company VISIA-CR ultraviolet photography equipment.
To avoid the effect of ambient uv light on the accuracy of the photography, in one embodiment of the invention, the uv photography is performed in a dark room.
The uv wavelengths used to illuminate the skin area of the subject in uv photography are conventional in the art. In one embodiment of the invention, the ultraviolet light irradiating the skin area to be tested is at a wavelength of 200-400nm (i.e., covering all wavelengths from short wavelength Ultraviolet (UVC) to long wavelength Ultraviolet (UVA)). In another embodiment of the present invention, the ultraviolet light that irradiates the skin area to be tested has a wavelength of 290nm to 320nm, i.e., medium Ultraviolet (UVB). In yet another embodiment of the present invention, the ultraviolet light that irradiates the area of skin under test has a wavelength of 320nm to 400nm, i.e., long-wave ultraviolet light (UVA).
After obtaining the ultraviolet photo of the tested skin area, the photo is used to read the light intensity value a of the tested area0. Reading photo light intensity value a0The method of (3) is not particularly limited and may be a known method. In one embodiment of the invention, the analytical measurement image software Imagep is usedro-Plus (IPP software) reading photo light intensity value a0。
The method of the present invention comprises applying a sunscreen product to the human skin to form an application zone. The area of the coating region and the amount of application are not particularly limited and may be conventional coating areas and amounts known in the art. In one example of the invention, the application area and the amount of application meet the requirements of the cosmetic hygiene code (2007). In one embodiment of the invention, the coating area is 3-20cm2Preferably 6-12cm2More preferably 8 to 10cm2. In another embodiment of the present invention, the coating amount is 1 to 3mg/cm2Preferably 1.5 to 2.5mg/cm2Preferably 2mg/cm2。
In one embodiment of the invention, a latex finger cuff is used to uniformly apply the sample to the area of skin being tested to form an applied area, followed by waiting 10-20 minutes, preferably 12-18 minutes, and preferably 15 minutes, before cleaning the applied sunscreen product with a cleaning product to form a clean area.
The method of cleaning with the cleaning product is not particularly limited and may be a conventional cleaning method known in the art, for example, applying the cleaning product clockwise or counterclockwise along the application zone followed by rinsing with running water.
In one embodiment of the invention, the cleaning method comprises applying the cleaning product to the application area for 5-20 turns, preferably 8-18 turns, more preferably 10-16 turns, followed by rinsing with clean water for 5-40 seconds, preferably 10-35 seconds, more preferably 15-30 seconds.
Since the method of the present invention is to evaluate or test the cleaning effect of various cleaning products on sunscreen products, the cleaning products are not particularly limited, and may be conventional cleansing aqueous, oily or emulsion products known at present, or various other cleansing aqueous, oily or emulsion products to be developed and prepared.
The method also comprises the steps of carrying out ultraviolet photography on the cleaning area and reading the light intensity data a of the area on the ultraviolet photography1. Conditions and apparatus for UV-photography of clean areas and the aforesaid method of testing skin areas of the human bodyThe conditions and equipment for blank UV photography were exactly the same. Reading the light intensity value a of the UV picture by using an analysis image software, such as an IPP software1。
In the present invention, the terms "photograph" and "image" are used interchangeably to refer to a photograph or image obtained by ultraviolet photography.
In the present invention, the terms "lightness" and "light intensity" are used interchangeably to refer to the lightness or light intensity of a particular area obtained from an ultraviolet image with photographic software, such as IPP software.
Finally, calculating the light intensity change rate delta of the cleaning area by using the following formula as an index of the skin residual quantity of the sunscreen product:
Δ＝(a0-a1)/a0。
the applicant has found that the rate of change of light intensity Δ in the cleaning zone is not always linear with the amount of sunscreen applied per unit area of skin. In order to better characterize the cleaning ability of the cleaning products to the sunscreen products, in a preferred embodiment of the invention, the light intensity change Δ in the cleaning area is converted to skin residue by means of a standard curve, which is then compared with the initial application amount to obtain the removal rate r:
r-1-residual amount/initial coating amount.
The method for making the standard curve is not particularly limited. In one embodiment of the present invention, the standard curve is prepared as follows:
(i) ultraviolet photographing an area of skin of a human body to be tested and reading light intensity data a of the area on the ultraviolet photographing0；
(ii) Applying the sunscreen product under test to the human skin at a specified application rate per unit area of skin to form an area of application;
(iii) UV-photograph the coated area and read the light intensity data a of the area on the UV-photograph1(ii) a And
(iv) the rate of change of light intensity Δ in the coated area was calculated according to the following formula:
Δ＝(a0-a1)/a0；
(v) smearing a series of sunscreen products with unit area coating amount in a test area, photographing before and after smearing, calculating light intensity and change rate before and after smearing, and correspondingly obtaining a series of light intensity change rates deltaiAnd the rate of change of the coating amount per unit area to the light intensity isiPlotted as a standard curve.
As can be seen from the above method for making the standard curve, the coating amount per unit area corresponding to the light intensity change rate Delta of the cleaning area in the standard curve is equal to the residual amount of the washed sunscreen product. That is, in the method of the present invention, the "application amount" is the initial application amount of the sunscreen product; the "residual amount" is the amount of sunscreen product remaining on the application area after washing.
FIG. 2 is a standard curve of the coating amount per unit area versus the rate of change in light intensity according to a preferred embodiment of the present invention, and clearly shows that the coating amount per unit area is non-linearly related to the rate of change in light intensity.
In a preferred embodiment of the present invention, the method for testing the cleaning ability of the cleaning product of the present invention on the human body comprises the following steps: the test site was spotted, an image of the skin of the site was taken, and the subject was photographed in a dark room using a VISIA-CR camera system (Canfield, usa). The spot is then applied with a sunscreen containing product, cleaned with the tested cleaning product after a specified time interval, and an image of the skin at the cleaned area is taken as in the above steps. Setting a region to be analyzed, intercepting a rectangular region in a tracing range, calculating average light intensity by adopting IPP software, and calculating an intensity change rate delta according to the average light intensity before using the product and after cleaning.
In one embodiment of the present invention, the method comprises the steps of:
(i) the method comprises the following steps of performing point tracing on an arm part, acquiring an arm part skin image, and photographing a subject by using a VISIA-CR photographing system (Canfield company, USA), wherein the image photographing conditions are as follows: the light source mode is UV-NF, the optical filter is standard, ISO is 250, the aperture is F9, white balance is sunlight, shooting is carried out in a darkroom, interference of external light is avoided, and the image at the upper left corner is an arm image obtained under the light source condition;
(ii) applying a product containing a sun-screening agent on the dotted part, cleaning the dotted part with a cleaning product after a certain time, and then acquiring a skin image of the arm part according to the steps;
(iii) and setting a region to be analyzed, and intercepting a rectangular region in the range of the point, as shown by the left and right middle images. The average light intensity was then calculated using IPP software to calculate the rate of change in intensity Δ.
In another embodiment of the present invention, the method of the present invention comprises the steps of:
(1) acquiring skin images of a subject under specific and consistent ultraviolet light source conditions;
(2) applying a sunscreen-containing product to the area to be tested;
(3) collecting the skin image again by using the ultraviolet light source in the step (1) after the product is smeared;
(4) removing the sunscreen product with the cleaning product at half an hour after the sunscreen product is applied;
(5) after the sun-proof product is removed, the ultraviolet light source in the step (1) is used for collecting the skin image again;
(6) selecting a region to be analyzed on the obtained skin image;
(7) calculating the average light intensity of the area to be analyzed;
(8) calculating the light intensity change rate according to the light intensity values before smearing and after removing;
(9) making a standard curve of the light intensity change rate and the residual quantity of the sunscreen product;
(10) converting the obtained light intensity change rate into the residual quantity of the sunscreen product according to the standard curve;
(11) the cleaning ability (removal rate r) of the cleaning product to the sunscreen product is calculated by the following formula:
r-1-residual amount/initial coating amount.
The invention provides the cleaning effect of the used cleaning product on the sunscreen product by measuring the skin residual quantity of the sunscreen product after cleaning, thereby providing a basis for evaluating the cleaning power of the cleaning product on the sunscreen product.
The image analysis method of the invention is established based on the change of the light intensity of the product containing the sun-screening agent by ultraviolet irradiation before and after the product containing the sun-screening agent is used on human skin, the contact time of the ultraviolet and the skin is short in the process, the skin damage cannot be caused, and a subject can be recycled, so the performance evaluation efficiency of the cleaning product for cleaning the sun-screening agent can be greatly improved in the aspects of time, cost, selection of the subject and damage degree.
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
Example 1
This example tests the rate of change of the light intensity of the skin after washing the sunscreen product with the cleaning product on a single subject
The method comprises the following steps of performing point tracing on an arm part, acquiring an arm part skin image, and photographing a subject by using VISIA-CR (Canfield corporation, USA), wherein the image photographing conditions are as follows: the light source mode is UV-NF, the optical filter is standard, ISO is 250, the aperture is F9, white balance is sunlight, and shooting is carried out in a darkroom, so that external light interference is avoided.
Spreading sunscreen (herborist fresh clean and transparent sunscreen lotion SPF30+ PA + + +, available from Shanghai Co., Ltd.) with area of 2 × 4cm at the dotted area2(ii) a The initial coating amount is 2mg/cm2。
After the product is applied for half an hour, cleaning the sun-screening product by using a cleaning product (Liushen fresh and moist shower gel, purchased from Shanghai's family and chemical Co., Ltd.), wherein the cleaning mode is as follows: smearing for 15 circles, and washing for 30s with clear water.
After the skin is dry after cleaning, the skin image of the arm part is collected again according to the method.
The area to be analyzed is set as follows: that is, a rectangular area is cut along the smearing area within the range of the point, the average light intensity is calculated by adopting IPP software, and the result uses the average light intensity a of the front ultraviolet photo of the sunscreen product085.44, average light intensity a after washing with a cleaning-type product1To 59.60, formula Δ ═ a (a) is used0-a1)/a0The change rate of the intensity was calculated as an index of the skin residual amount of the herborist new clear repair sunscreen lotion, and Δ was 30.24%.
Example 2
This example prepares a standard curve of the rate of change of light intensity versus the amount of sunscreen used
12 healthy women of 25-55 years old are selected as tested volunteers, the front side arm parts of the hands of the women have no obvious scars or pigmentation, and meanwhile, the skin color is required to be white.
The method comprises the following steps of performing point tracing on an arm part, acquiring an arm part skin image, and photographing a subject by using VISIA-CR (Canfield corporation, USA), wherein the image photographing conditions are as follows: the light source mode is UV-NF, the optical filter is standard, ISO is 250, the aperture is F9, white balance is sunlight, and shooting is carried out in a darkroom, so that external light interference is avoided.
5 groups (zones) are marked on the lateral arm of each test volunteer, each zone being coated with a different amount of sunscreen product: blank group (no sunscreen product applied); 0.25mg/cm2Group (d); 0.5mg/cm2Group (d); 1mg/cm2Group (d); 2mg/cm2And (4) grouping. Spreading the above-mentioned amount of the sun-screening product "herborist New clear and transparent repairing sun-screening liquid SPF30+ PA + + +" purchased from Shanghai household except blank group on the marked part, wherein the spreading area is 2 × 4cm2。
And acquiring the skin image of the arm part again according to the method.
After the product is applied for half an hour, cleaning the sun-screening product by using a cleaning product (Liushen fresh and moist shower gel, purchased from Shanghai's family and chemical Co., Ltd.), wherein the cleaning mode is as follows: smearing for 15 circles, and washing for 30s with clear water.
After the skin is dry after cleaning, the skin image of the arm part is collected again according to the method.
The area to be analyzed is set as follows: namely, a rectangular area is cut along the smearing area in the range of the point drawing, and average light intensity is calculated by adopting IPP software to respectively obtain the average light intensity a of the ultraviolet photo before the sunscreen product is used0Value and average light intensity a after application1The value, then, is given by the formula Δ ═ a0-a1)/a0And calculating the intensity change rate as an index of the skin residual quantity. The results are shown in FIG. 2, in which the delta values are plotted against the amount of sunscreen applied per unit area as a standard curve (the rate of change in light intensity is plotted on the ordinate, and the amount of sunscreen applied per unit area is plotted on the abscissa).
FIG. 2 is a standard curve of the amount of sunscreen product versus the rate of change of light intensity. It can be seen from the figure that the greater the amount of sunscreen product applied to the skin, the greater the rate of change of light intensity. According to the standard curve, the light intensity change rate after cleaning relative to that before coating can be converted into the residual quantity of the sun-protection product after cleaning on the skin, and then the removal rate of the cleaning product on the sun-protection product can be calculated.
Example 3
In this embodiment, the light intensity variation of different cleaning products after the sun-screening products are removed is evaluated in batch, and the removal rate of the sun-screening products by different cleaning products is compared by combining the standard curve in embodiment 2, so as to demonstrate the feasibility of the method.
Volunteer selection: 12 healthy female subjects of 25-55 years old are selected, and the front side arm parts of hands have no obvious scars or pigmentation and are required to have white skin color.
The method comprises the following steps of performing point tracing on an arm part, acquiring an arm part skin image, and photographing a subject by using VISIA-CR (Canfield corporation, USA), wherein the image photographing conditions are as follows: the light source mode is UV-NF, the optical filter is standard, ISO is 250, the aperture is F9, white balance is sunlight, and shooting is carried out in a darkroom, so that external light interference is avoided.
Each subject was marked with 3 groups (regions) of 2X 4cm on the lateral arm side2And 3 groups all adopt the same sun-proof product: herborist New clear and thorough-repair sunscreen SPF30+ PA + + + (available from Shanghai Co., Ltd.) with initial application amounts of 2mg/cm2The difference between the groups is that the cleaning products for removing the sunscreen lotion are different: the lotion is Liushen fresh and moist bath cream (purchased from Shanghai home-based joint products, Inc.), herborist skin-nourishing and skin-brightening makeup-removing cream (purchased from Shanghai home-based joint products, Inc.) and clear water.
After the product is applied for half an hour, the skin image of the arm part is collected according to the method. Subsequently, the sunscreen product is cleaned by using the respective cleaning products in the following way: smearing for 15 circles, and washing for 30s with clear water.
After the skin is dry after cleaning, the skin image of the arm part is collected again according to the method.
The area to be analyzed is set as follows: the method is characterized in that a rectangular area is cut along a smearing area in a point drawing range, average light intensity is calculated by adopting IPP software, and a light intensity change rate calculation formula is as follows:
light intensity change rate Δ ═ a0-a1)/a0
a0Is the average light intensity of the uv photograph before use of the sunscreen product;
a1the average light intensity of an ultraviolet photo after cleaning by adopting a cleaning product;
and calculating the removal rate r using the following formula:
removal rate r is 1-residual amount/initial application amount
The residual amount is calculated by combining the light intensity change rate in the present embodiment with the standard curve of the light intensity change rate in embodiment 2;
the results are shown in Table 1 below.
Table 1: corresponding light intensity, light intensity change rate and removal rate after cleaning with different cleaning products (X + -SD; n is 14)
| Cleaning product | a0 | a | a1 | Δ | r |
| Liushen fresh and nourishing shower gel | 85.44±21.79 | 29.45±6.22 | 59.60±18.36# | 30.17％#▲ | 90.44％ |
| Makeup removing cream | 84.67±20.18 | 29.87±6.46 | 54.13±17.71 | 36.60％# | 87.99％ |
| Clean water | 88.74±16.19 | 30.01±4.77 | 41.84±7.24 | 52.32％ | 39.64％ |
# represents a significant difference relative to clear water, P < 0.05;
a represents significant difference relative to the makeup removal cream, P < 0.05;
from table 1, it can be known that the shower gel, the makeup remover and the clear water all have the effect of removing the sunscreen product to a certain extent, wherein the clear water has the lowest removal rate on the sunscreen product, and only 39.64% of the sunscreen product can be removed; the removal rate of the Liushen fresh and moist shower gel and the makeup removing cream on the sunscreen product reaches more than 85 percent, the removal rate of the Liushen fresh and moist shower gel and the makeup removing cream on the sunscreen product is higher than that of clear water, and the Liushen fresh and moist shower gel and the makeup removing cream have significant difference relative to the clear water. The removal rate of the shower gel to the sunscreen product is higher than that of the makeup removing cream, and the shower gel has a significant difference relative to the makeup removing cream.
The embodiment shows that the method can detect the removal capacity of different cleaning products to the sunscreen products and can distinguish the removal capacity of different cleaning products to the sunscreen products. Therefore, the method of the invention can be used for advantageously evaluating the cleaning effect of the cleaning product on the sunscreen product by detecting the residual quantity of the skin of the sunscreen product.
Claims (14)
1. Use of a uv image analysis method for evaluating the cleaning effect of a cleaning product on a sunscreen product, the uv image analysis method comprising the steps of:
(i) ultraviolet photographing an area of skin of a human body to be tested and reading light intensity data a of the area on the ultraviolet photographing0；
(ii) Applying the sunscreen product under test to the human skin to form an application area;
(iii) cleaning the coated area with a cleaning product, UV-photographing the cleaned area and reading the light intensity data a of the area on the UV-photograph1(ii) a And
(iv) calculating the light intensity change rate delta of the cleaning area according to the following formula as an index of the skin residue of the sunscreen product:
Δ＝(a0-a1)/a0。
2. the use according to claim 1, said ultraviolet image analysis method further comprising the steps of:
(v) coating a series of sunscreen products with unit area coating amount in a test area, photographing before and after coating, calculating light intensity and change rate before and after coating, correspondingly obtaining a series of light intensity change rates, and drawing the light intensity change rates with the unit area coating amount as a standard curve;
(vi) and (3) converting the light intensity change rate delta of the step (iv) into the unit area residual quantity of the sunscreen product according to the obtained standard curve, and calculating the removal rate r according to the following formula:
r-1-residual amount/initial application amount.
3. Use according to claim 1 or 2, characterized in that the wavelength of the ultraviolet light used for ultraviolet photography is 200-400 nm.
4. Use according to claim 1 or 2, characterized in that the wavelength of the ultraviolet light used for ultraviolet photography is 290nm to 320 nm.
5. Use according to claim 1 or 2, characterized in that the wavelength of the ultraviolet light used for ultraviolet photography is 320nm to 400 nm.
6. Use according to claim 1 or 2, characterized in that the coating area of the coating zone is 3-20cm2。
7. Use according to claim 1 or 2, characterized in that the coating area of the coating zone is 6-12cm2。
8. Use according to claim 1 or 2, characterized in that the coating area of the coating zone is 8-10cm2。
9. Use according to claim 1 or 2, characterized in that the application area is applied in an amount of 1-3mg/cm2。
10. Use according to claim 1 or 2, characterized in that the application area is applied in an amount of 1.5-2.5mg/cm2。
11. Use according to claim 1 or 2, characterized in that the application area is applied in an amount of 2mg/cm2。
12. Use according to claim 1 or 2, characterized in that the step of cleaning the application area with the cleaning product comprises applying the application area with the cleaning product for 5-20 cycles, followed by rinsing with clean water for 5-40 seconds.
13. Use according to claim 1 or 2, characterized in that the step of cleaning the application area with a cleaning product comprises applying the application area with the cleaning product for 8-18 cycles followed by rinsing with clean water for 10-35 seconds.
14. Use according to claim 1 or 2, characterized in that the step of cleaning the application area with a cleaning product comprises applying the application area with the cleaning product for 10-16 cycles followed by rinsing with clean water for 15-30 seconds.
Priority Applications (1)
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