CN110710980A - Latent fingerprint showing cotton piece and application - Google Patents
Latent fingerprint showing cotton piece and application Download PDFInfo
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- CN110710980A CN110710980A CN201910955579.XA CN201910955579A CN110710980A CN 110710980 A CN110710980 A CN 110710980A CN 201910955579 A CN201910955579 A CN 201910955579A CN 110710980 A CN110710980 A CN 110710980A
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- A61B5/117—Identification of persons
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- A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a latent fingerprint appearing cotton piece and application thereof. The cotton sheet with fingerprint showing effect is prepared through soaking non-woven fabric as base material in fingerprint showing agent, adsorbing to form wet base material, and loading fingerprint showing agent. Soaking the cotton sheet in a developing agent to prepare a developing cotton sheet, wherein the developing cotton sheet which does not pollute the latent fingerprint object can be obtained by controlling the amount of the developing agent; the revealing cotton piece is covered on the object containing the latent fingerprints, the object is naturally dried after the cotton piece is removed, and fingerprint lines can be observed under a light source matched with the revealing agent, so that the revealing cotton piece is suitable for photographing and recording. The method for displaying the latent fingerprints on the cotton sheets has the advantages of good developing effect, portability, simplicity and convenience in operation and short developing time; the application range is wide, and the cotton sheets with different sizes and carrying different developing agents can be prepared; can be repeatedly used, and is suitable for criminal investigation field operation and industrial production.
Description
Technical Field
The invention relates to a fingerprint display method, in particular to a display cotton piece based on a non-woven fabric substrate and application thereof, belonging to the technical field of trace detection.
Background
With the development of an Automatic Fingerprint Identification System (AFIS), fingerprints, which are a non-negligible part of fingerprint identification because they are commonly found in a scene and invisible to the naked eye, are of great interest to researchers as one of important material evidences in criminal investigation and forensic science.
Latent fingerprints can be classified into occult blood fingerprints, sweat latent fingerprints and oil fingerprints according to the components of the latent fingerprints. One of the most commonly used methods for visualizing occult blood fingerprints at present is a chemical enhancement method, i.e. an appropriate chemical agent is selected and an appropriate operation method is combined for visualizing occult blood fingerprints. Today, many chemical agents have been demonstrated to be effective in directly visualizing latent fingerprints and greasy fingerprints of sweat, but research into visualizing the operating methods is not complete. The dip coating method, the dipping method, the spray coating method, etc., which are mainly used at present, have more or less limitations, such as the need for pretreatment and/or post-treatment of fingerprints, inconvenience in carrying and storing reagents, long development period, etc. In addition, the dipping method is only suitable for small-sized objects, the dipping method may cause uneven appearance and damage to fingerprint patterns, and the spraying method may cause injury to operators due to volatilization of a large amount of solvent. Due to the limitations of the existing methods, the operational methods available for the chemical enhancement method to reveal latent fingerprints have not been able to meet the enormous demands of practical applications at actual crime scenes to date. Therefore, it is of great significance to develop a latent fingerprint presentation method which is simple, efficient, portable and wide in application range.
Cotton sheets based on nonwoven fabric substrates have excellent water absorption and water release properties and have been widely used for wiping and removing makeup of cosmetics. However, the latent fingerprint wet-face sheet which is convenient to carry, simple to operate and good in developing effect is not reported by using the non-woven fabric substrate as a carrier of the developing agent, particularly for a latent fingerprint field which is invisible to naked eyes.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the latent fingerprint showing cotton piece which has the advantages of good developing effect, portability, simple and convenient operation, wide application range, reusability and suitability for criminal investigation field operation and industrial production and application thereof.
The technical scheme for realizing the aim of the invention is to provide a latent fingerprint showing cotton sheet, which is obtained by taking non-woven fabrics as a base material, soaking the non-woven fabrics in a fingerprint showing agent, adsorbing the non-woven fabrics to ensure that the base material is in a wet state and loading the fingerprint showing agent.
The latent fingerprint appearing cotton sheet provided by the technical scheme of the invention has the preferable scheme that:
the amount of the fingerprint developing agent adsorbed on the base material is 5 mu L/cm2～50 μL/cm2。
The fingerprint developing agent comprises a occult blood fingerprint developing agent, a sweat fingerprint developing agent and an oil fingerprint developing agent.
The latent fingerprint showing cotton piece comprises a single fingerprint, a plurality of fingerprints or a large-area latent fingerprint showing cotton piece.
The latent fingerprint showing cotton sheet is sealed and stored in a dark place.
The technical scheme of the invention also comprises the application of the latent fingerprint revealing cotton piece, which is used for carrying out fingerprint revealing on latent blood fingerprints, latent sweat fingerprints and latent grease fingerprints.
The latent fingerprint developing cotton piece is applied to developing latent blood fingerprints and comprises the following steps:
(1) fixing fresh occult blood fingerprint blood: immersing the object loaded with the fresh occult blood fingerprint into absolute ethyl alcohol, soaking for 2-3 min, taking out and naturally drying; or standing the object loaded with the fresh occult blood fingerprint in a cool and dry place for more than 12 hours;
(2) flatly covering the object loaded with the occult blood fingerprint revealing agent with an occult blood fingerprint revealing cotton piece, slightly pressing to enable the cotton piece to be fully contacted with the object, and standing for 2-5 min; the object loaded with the occult blood fingerprint is the fresh occult blood fingerprint or the old occult blood fingerprint processed in the step (1);
(3) and (3) smoothly taking off the cotton sheet from the object, drying, and shooting under the illumination condition matched with the developing agent to obtain the occult blood fingerprint developed by the developing cotton sheet.
The latent fingerprint revealing cotton piece is applied to revealing latent fingerprint of sweat or latent grease fingerprint, and comprises the following steps:
(1) flatly covering a latent fingerprint revealing cotton sheet loaded with a sweat latent fingerprint or oil-submerged grease fingerprint revealing agent on an object loaded with a sweat latent fingerprint or oil-submerged grease fingerprint, slightly pressing to enable the cotton sheet to be fully contacted with the object, and standing for 2-5 min;
(2) and (3) smoothly taking off the cotton sheet from the object, drying, and shooting under the illumination condition matched with the developing agent to obtain the latent sweat fingerprint or the grease fingerprint developed by the developing cotton sheet.
The latent fingerprint developing agent is loaded on the non-woven fabric base material to prepare the developing cotton sheet, and an unexpected effect is generated, which is mainly embodied in the following aspects: 1. the method is used for displaying latent fingerprints, the operation process is convenient and simple, and the objects loaded with the latent fingerprints do not need to be subjected to post-treatment; 2. the dosage of the developing agent can be accurately controlled in advance, and the waste caused by field operation is reduced as much as possible; 3. the size and the position of the fingerprint object are not strictly limited, so that the on-site investigation of the latent fingerprint is easier; 4. due to the use of the revealing cotton piece, the amount of the reagent which is vaporized into the air and/or remained in the air is greatly reduced, and the pollution to the environment and the harm to the health of a user are greatly reduced; 5. the cotton piece soaked by the developing solution is put into a container or a bag for sealing, so that the cotton piece is convenient to carry and store for a long time, and can be repeatedly used.
Compared with the prior art, the invention has the beneficial effects that:
1. the preparation method of the revealing cotton piece provided by the invention has no special material requirement on the base material of the cotton piece, only needs the texture of the revealing cotton piece to be soft, does not damage the fingerprint pattern, and has excellent water absorption and water release performance.
2. The method for showing the latent fingerprints on the cotton piece is suitable for all the situations that the latent fingerprints are shown by using a chemical reagent, the shown fingerprint patterns are clear, the showing agent is uniformly distributed on fingerprint lines, and no showing agent residue exists on the surface of an object background.
3. The latent fingerprint showing method provided by the invention is convenient and simple in operation process, and does not need pretreatment and/or post-treatment.
4. The showing cotton sheet provided by the invention is put into a sealed lightproof bag or container, is convenient to carry and can be stored for a long time.
5. The revealing cotton sheet provided by the invention can accurately control the dosage of the revealing agent in advance, and reduce the waste caused by field operation.
6. The latent fingerprint showing method provided by the invention has no strict limitation on the size and the position of the fingerprint object, and can cope with various conditions of criminal scene investigation.
7. The developing cotton sheet provided by the invention can lock the developing agent to a certain degree, so that the amount of the reagent evaporated into the air and/or remained in the air is reduced, and the environmental pollution and the harm to the health of a user are reduced to a great extent.
8. The revealing cotton sheet based on the non-woven fabric base material can be repeatedly used. If the developing cotton piece (2 cm multiplied by 3 cm) soaked by 150 mu L of Coomassie blue solution can effectively develop at least 5 latent blood fingerprints.
Drawings
FIG. 1 is a digital photograph and an optical microscope photograph of a cotton sheet for developing a base material, a cotton sheet for developing adsorbing a developer, and a cotton sheet for developing in example 1 of the present invention; wherein, a is a digital photograph of the substrate, b is a digital photograph of the cotton piece with the Coomassie blue developing agent adsorbed thereon, and c is an optical microscope photograph of the cotton piece with the Coomassie blue developing agent adsorbed thereon.
FIG. 2 is a comparison graph of latent fingerprint appearance provided in example 2 of the present invention, a1～a4Respectively showing the effect of developing cotton sheets soaked with amino black 10B, coomassie blue, eosin and acid fuchsin on the latent blood fingerprint on the object on the cover glass, B1～b4To show the effect of the latent blood fingerprints on the coverslip objects by dip coating using aminoblack 10B, Coomassie blue, eosin and acid fuchsin visualization agents, respectively, c1～c4The figure shows the effect of developing the latent blood fingerprint on the object on the cover glass by dip coating using aminoblack 10B, Coomassie blue, eosin and acid fuchsin developing agents, respectively, d1～d4The figure shows the effect of developing the latent blood fingerprint on the object on the cover glass by spraying with aminoblack 10B, coomassie blue, eosin and acid fuchsin developing agents.
FIG. 3 is a comparison graph of latent fingerprint appearance provided in example 3 of the present invention, a1～a4Respectively, developing cotton piece soaked with amino black 10B, Coomassie blue, eosin and acid fuchsin to white enamelPattern of appearance of latent blood fingerprints on the object, b1～b4To show the effect of occult blood fingerprints on white enamel objects by dip coating using aminoblack 10B, Coomassie blue, eosin and acid fuchsin visualization agents, respectively, c1～c4The effect chart is that the jet developing method is used for developing the occult blood fingerprint on the white enamel object by using aminoblack 10B, Coomassie blue, eosin and acid fuchsin developing agents respectively.
FIG. 4 is a picture of latent fingerprints of fats and oils under ultraviolet light (365 nm) after development with PPV nanoparticles, provided in example 4 of the present invention, wherein a is a development effect picture of latent fingerprints of fats and oils using development cotton, b is an effect picture developed using a soaking method, c is an effect picture developed using a smearing method, and d is an effect picture developed using a spraying method.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Example 1
The embodiment provides a preparation method of a Coomassie blue solution fingerprint appearing cotton piece, which comprises the following specific steps:
1. the cotton nonwoven fabric substrate was cut into a size of 2 cm × 3 cm.
2. Preparation of developer-loaded revealing Cotton flakes
Putting 0.02 g of Coomassie blue solid into a 50mL conical flask, sequentially adding 1 mL of glacial acetic acid and 9 mL of absolute ethanol solution at normal temperature, shaking the conical flask to completely dissolve the solid to obtain 10 mL of Coomassie blue developing agent, putting 300 mu L of the developing agent into a weighing flask, putting two cut cotton sheets into the weighing flask, and soaking for 1min to obtain the Coomassie blue developing cotton sheet;
putting 0.1 g of amino black 10B solid into a 50mL conical flask, sequentially adding 0.5 mL of glacial acetic acid and 9.5 mL of absolute ethyl alcohol solution, shaking the conical flask to completely dissolve the solid to obtain 10 mL of amino black 10B developing agent, putting 300 mu L of the developing agent into a weighing flask, putting two cut cotton sheets into the weighing flask, and soaking for 1min to obtain an amino black 10B developing cotton sheet;
taking 0.1 g of eosin solid, sequentially adding 10 mL of absolute ethanol solution into a 50mL conical flask, shaking the conical flask to completely dissolve the solid to obtain 10 mL of eosin developing agent, taking 300 mu L of the developing agent into a weighing flask, putting two cut cotton sheets into the weighing flask, and soaking for 1min to obtain eosin developing cotton sheets;
and (2) putting 0.02 g of acid fuchsin solid into a 50mL conical flask, sequentially adding 10 mL of deionized water, shaking the conical flask to completely dissolve the solid to obtain 10 mL of amino acid fuchsin developing agent, putting 300 mu L of developing agent into a weighing flask, putting two cut cotton sheets into the weighing flask, and soaking for 1min to obtain the acid fuchsin developing cotton sheet.
3. Sealing the weighing bottle filled with the various showing cotton sheets, and storing in a cool and dry place.
Referring to fig. 1, it is a digital photograph of a revealing cotton piece substrate, revealing cotton piece adsorbed with a revealing agent and an optical microscope photograph of the revealing cotton piece provided in this example; wherein, a is a digital photo of the base material, b is a digital photo of the showing cotton piece absorbed with the Coomassie blue showing agent, and c is an optical microscope photo of the showing cotton piece absorbed with the Coomassie blue showing agent; as can be seen from fig. 1, the pore size of the cotton sheet was almost completely filled with coomassie blue solution compared to the substrate, and the color of the cotton sheet was brilliant blue.
Example 2
The embodiment provides a method for displaying an occult blood fingerprint on the surface of an object of a cover glass by using a cotton piece prepared in embodiment 1, and comparing a fingerprint picture obtained under natural light with a fingerprint picture obtained by displaying the occult blood fingerprint by using a soaking method, a dipping method and a spraying method, which comprises the following specific steps:
1. placing the cover glass object loaded with the fresh occult blood fingerprint in a cool and dry place for 24 hours;
2. respectively flatly covering the revealing cotton sheets soaked in the revealing agents of amino black 10B, Coomassie blue, eosin and acid fuchsin prepared in the example 1 on 4 cover glass objects loaded with latent blood fingerprints, slightly pressing to ensure that the cotton sheets are fully contacted with the objects, and standing for 2 min;
3. and (3) smoothly taking off the cotton sheet from the cover glass, drying, and shooting under natural illumination to obtain the occult blood fingerprint shown by the cotton sheet.
Referring to FIG. 2, there is shown a photograph of an object covered with a cover glass showing an occult blood fingerprint using different cotton sheets prepared in example 1, and a photograph of the object covered with the cover glass showing an occult blood fingerprint by immersion, dipping, spraying and development under natural illumination; wherein, a1～a4The figure corresponds to the effect of developing cotton sheets soaked with amino black 10B, Coomassie blue, eosin and acid fuchsin on the latent blood fingerprint on the object on the cover glass respectively, B1～b4The figure shows the effect of using aminoblack 10B, coomassie blue, eosin and acid fuchsin developing agent to develop the latent blood fingerprint on the object on the cover glass by soaking method, c1～c4The figure shows the effect of developing the latent blood fingerprint on the object on the cover glass by dip coating using aminoblack 10B, Coomassie blue, eosin and acid fuchsin developing agents, respectively, d1～d4The figure shows the effect of developing the latent blood fingerprint on the object on the cover glass by spraying with aminoblack 10B, coomassie blue, eosin and acid fuchsin developing agents.
As can be seen from figure 2, the occult blood fingerprints displayed by the four developing agent cotton sheets have good developing effect by adopting the cotton sheet method, and the developed fingerprint patterns are clear and visible and can be used for fingerprint identification; the occult blood fingerprint developed by the soaking method has the phenomenon that partial or even whole fingerprint patterns cannot be observed, the pattern of the occult blood fingerprint developed by the dip coating method is not uniform, and the grain of the occult blood fingerprint developed by the spraying method can be damaged or stain residues of a developing agent are left.
Example 3
The embodiment provides a method for displaying an occult blood fingerprint on the surface of a white enamel object by preparing a display cotton piece, and comparing a fingerprint picture obtained under natural light with a fingerprint picture obtained by displaying the occult blood fingerprint by a dip coating method and a spray display method.
The specific steps for preparing the revealing cotton piece are as follows:
1. the cotton non-woven fabric substrate is cut into 20 cm multiplied by 30 cm.
2. Preparation of developer-loaded revealing Cotton flakes
Putting 2.00 g of Coomassie blue solid into a 1L conical flask, sequentially adding 100 mL of glacial acetic acid and 900 mL of absolute ethanol solution at normal temperature, shaking the conical flask to completely dissolve the solid to obtain 1.0L of Coomassie blue developing agent, and soaking a cut cotton piece in 30mL of developing agent for 2 min to obtain a Coomassie blue developing cotton piece;
putting 1.00 g of amino black 10B solid into a 1L conical flask, sequentially adding 50mL of glacial acetic acid and 950 mL of absolute ethanol solution, shaking the conical flask to completely dissolve the solid to obtain 1L of amino black 10B developing agent, and soaking a cut cotton piece in 30mL of developing agent for 2 min to obtain an amino black 10B developing cotton piece;
taking 10 g of eosin solid, sequentially adding 1L of anhydrous ethanol solution into a 1L conical flask, shaking the conical flask to completely dissolve the solid to obtain 1L of eosin developing agent, and soaking a cut cotton piece in 30mL of developing agent for 2 min to obtain an eosin developing cotton piece;
taking 2 g of acid fuchsin solid into a 1L conical flask, adding 1L of deionized water, shaking the conical flask to completely dissolve the solid to obtain 1L of amino acid fuchsin developing agent, and soaking a cut cotton piece into 30mL of developing agent for 2 min to obtain the acid fuchsin developing cotton piece.
3. Sealing the various showing cotton sheets obtained by the preparation in a plastic bag, and storing in a cool and dry place.
The steps for displaying the fingerprint of the old occult blood are as follows:
1. respectively taking a piece of revealing cotton piece soaked in amino black 10B, Coomassie blue, eosin and acid fuchsin revealing agents in the embodiment, respectively flatly covering 4 white enamel objects loaded with old occult blood fingerprints, slightly pressing to ensure that the cotton piece is fully contacted with the objects, and standing for 2 min;
2. the cotton piece is smoothly taken off from the white enamel, and after drying, the occult blood fingerprint displayed by the cotton piece is obtained by shooting under the natural illumination.
Referring to FIG. 3, it shows the photographs of different cotton pieces for revealing the fingerprint of occult blood on the object of the cover glass and the occult blood fingerprint revealed by dipping and sprayingAt present, the picture is under natural illumination; wherein, a1～a4The figure is a picture of the effect of developing cotton sheets soaked with amino black 10B, coomassie blue, eosin and acid fuchsin on the latent blood fingerprints on white enamel objects, respectively, B1～b4The figure shows the effect of developing occult blood fingerprints on white enamel objects by dip coating using aminoblack 10B, Coomassie blue, eosin and acid fuchsin developing agents, respectively, c1～c4The figure shows the effect of developing occult blood fingerprints on white enamel objects by spraying developing method using aminoblack 10B, Coomassie blue, eosin and acid fuchsin developing agents respectively.
As shown in the attached figure 3, the occult blood fingerprints displayed by the four developing agent cotton sheets have good display effect by adopting a cotton sheet method, and the displayed fingerprint patterns are all clear, visible and uniformly dyed and can be used for fingerprint identification; the dip coating method and the spraying method can cause damage and pollution to fingerprints, and the soaking method cannot be used for displaying occult blood fingerprints on the surfaces of white enamel objects.
Example 4
In the embodiment, aiming at the grease latent fingerprint on the surface of an aluminum foil object, PPV nano particles obtained by the preparation method provided by the publication number CN106248647A are used as a developing agent to prepare a developing cotton piece for developing the latent blood fingerprint, and the developing result is compared with a dipping coating method, a soaking method and a spraying developing method.
The preparation method of the developing agent comprises the following steps:
1. according to the technical scheme disclosed by the Chinese invention patent (CN 104845052A), a poly-p-phenylene vinylene precursor solution (pre-PPV) is prepared. Adding 5 mL of prepared pre-PPV into a two-neck flask under an anaerobic condition, adding 15 mL of deionized water for dilution, adding 0.2003 g of Sodium Dodecyl Sulfate (SDS) (0.0007 mol), heating to 50 ℃, adding 0.2 mL of triethylamine (0.0014 mol) serving as an elimination reaction catalyst after the sodium dodecyl sulfate is completely dissolved, continuing heating to 80 ℃, and continuously stirring for reaction for 3 hours to obtain 18 mL of PPV nanoparticle suspension.
2. And (3) taking 1 mL of the suspension prepared in the step 1, adding 4 mL of deionized water for dilution to obtain a developing solution with the volume of 5 mL, and placing the developing solution in a weighing bottle for later use.
The obtained developing agent is prepared into a developing cotton piece for developing occult blood fingerprints, and the developing result is compared with a dipping coating method, a soaking method and a spraying developing method, and the method comprises the following specific steps:
1. placing 2 pieces of cotton sheet of 2 cm × 3 cm in a weighing bottle containing 300 μ L of PPV nanoparticle solution, and soaking for 1 min;
2. taking a soaked cotton piece, flatly covering the soaked cotton piece on an aluminum foil object loaded with the grease latent fingerprint, slightly pressing to ensure that the cotton piece is fully contacted with the object, and standing for 2 min;
3. and (3) smoothly taking off the cotton piece from the aluminum foil, drying, and shooting under natural illumination to obtain the grease latent fingerprint displayed by the displayed cotton piece.
Referring to fig. 4, it is a photograph of a cotton piece prepared from PPV nanoparticles for revealing latent fingerprints of grease on an aluminum foil object and a photograph of a piece prepared from the same PPV nanoparticle solution as a revealing agent under natural illumination after revealing the fingerprints of grease by respectively adopting a dip coating method, a soaking method and a spray-developing method; the figure a is a showing effect picture of oil fingerprint latent by using showing cotton piece, the figure b is a showing effect picture by using soaking method, the figure c is a showing effect picture by using smearing method, and the figure d is a showing effect picture by using spraying method.
As is apparent from the comparison result shown in the attached figure 4, the latent fingerprints of the grease, which are shown by adopting the cotton piece method and the soaking method, have clearer fingerprint lines.
Claims (8)
1. A latent fingerprint revealing cotton sheet characterized in that: it uses non-woven fabric as base material, and soaks in fingerprint developing agent, after adsorption, the base material is wet, and loaded with fingerprint developing agent so as to obtain the invented cotton sheet with latent fingerprint.
2. A latent fingerprint revealing cotton sheet according to claim 1 wherein: the amount of the fingerprint developing agent adsorbed on the base material is 5 mu L/cm2～50μL/cm2。
3. A latent fingerprint revealing cotton sheet according to claim 1 or 2, wherein: the fingerprint developing agent comprises a occult blood fingerprint developing agent, a sweat fingerprint developing agent and an oil fingerprint developing agent.
4. A latent fingerprint revealing cotton sheet according to claim 1 wherein: it includes single fingerprint, multiple fingerprints or large area latent fingerprint showing cotton piece.
5. A latent fingerprint revealing cotton sheet according to claim 1 wherein: the latent fingerprint showing cotton sheet is sealed and stored in a dark place.
6. Use of a latent fingerprint revealing cotton sheet according to claim 1 wherein: it is used for fingerprint display of occult blood fingerprint, latent sweat fingerprint and latent oil fingerprint.
7. Use of a latent fingerprint revealing cotton sheet according to claim 6 wherein: the application of the method to the visualization of the occult blood fingerprint comprises the following steps:
(1) fixing fresh occult blood fingerprint blood: immersing the object loaded with the fresh occult blood fingerprint into absolute ethyl alcohol, soaking for 2-3 min, taking out and naturally drying; or standing the object loaded with the fresh occult blood fingerprint in a cool and dry place for more than 12 hours;
(2) flatly covering the object loaded with the occult blood fingerprint revealing agent with an occult blood fingerprint revealing cotton piece, slightly pressing to enable the cotton piece to be fully contacted with the object, and standing for 2-5 min; the object loaded with the occult blood fingerprint is the fresh occult blood fingerprint or the old occult blood fingerprint processed in the step (1);
(3) and (3) smoothly taking off the cotton sheet from the object, drying, and shooting under the illumination condition matched with the developing agent to obtain the occult blood fingerprint developed by the developing cotton sheet.
8. Use of a latent fingerprint revealing cotton sheet according to claim 6 wherein: the method is applied to the visualization of the latent sweat fingerprint or the latent oil grease fingerprint and comprises the following steps:
(1) flatly covering a latent fingerprint revealing cotton sheet loaded with a sweat latent fingerprint or oil-submerged grease fingerprint revealing agent on an object loaded with a sweat latent fingerprint or oil-submerged grease fingerprint, slightly pressing to enable the cotton sheet to be fully contacted with the object, and standing for 2-5 min;
(2) and (3) smoothly taking off the cotton sheet from the object, drying, and shooting under the illumination condition matched with the developing agent to obtain the latent sweat fingerprint or the grease fingerprint developed by the developing cotton sheet.
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| CN115322776A (en) * | 2022-07-12 | 2022-11-11 | 公安部物证鉴定中心 | Fingerprint developing agent based on nitrogen-doped multicolor fluorescent carbon dots, preparation method and application |
| CN115322775A (en) * | 2022-07-12 | 2022-11-11 | 公安部物证鉴定中心 | Fingerprint developing agent based on nitrogen-doped carbon quantum dots, preparation method and application |
| CN115322775B (en) * | 2022-07-12 | 2024-05-03 | 公安部物证鉴定中心 | Fingerprint developing agent based on nitrogen-doped carbon quantum dots, preparation method and application |
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