KR20190087090A - Manufacturing Method of Natural Indigo Pigments by Using Polygonum indigo - Google Patents

Abstract

The present invention relates to a method of preparing a natural blue pigment using Polygonum indigo. More specifically, the method of preparing a natural blue pigment using Polygonum indigo comprises the following steps of: (a) immersing Polygonum indigo grass into water to separate blue bubbles; (b) drying the bubbles and processing the dried bubbles in the form of a lump to purify the lump; (c) mixing the purified lump with water, separating a supernatant from a mixture, and leaving alone the supernatant-removed mixture to obtain a powder; (d) mixing the obtained powder with a gelatin solution to obtain a blue solid matter; (e) removing water of the blue solid matter; and (f) naturally drying the blue solid matter. According to the present invention, a blue pigment prepared using the bubbles formed in the step of extracting pigments by using Polygonum indigo exhibits excellent colors during thin coloring or deep coloring in Korean painting since the blue pigment is prepared by selecting fine particles only. Further, the blue pigment is useful for extensive utilization in the art world when the blue pigment is used as color paint or the like since the blue pigment has color fastness and stability and has a decolorization or discoloration preventing effect and an insect-proof effect.

Description

Technical Field [0001] The present invention relates to a method for producing natural blue pigments using natural pigments,

The present invention relates to a method for producing a natural blue pigment using a side, and more particularly, to a method for producing a natural blue pigment using a side including a step of separating and drying a blue foam using a side paste.

One of the important aesthetic characteristics of Korean painting is clear and transparent. Clear and transparent characteristics are distinctly different from Chinese and Japanese art. Especially, blue color is a part of Korean paintings, not only in sky, water, rocks and trees, but also in the representation of objects such as costumes of figures. However, the preparation method of blue pigments is not clear. The blue color which is presumed to have been used in the paintings in the history is shown in the paintings in history (although it can be seen that the blue pigment was used through the palm of the palm of the palm tree) (Changkyeong Palace Repairing Bureau, 1633) (1876), King Hyeonjae (1876), King Hyeonjae (1876), King Hyeonjae (1876) Etc.), it is presumed that the blue-colored particles used here are thicker and thicker, using sediments), and there is no record of what the raw materials are or how they are made.

Pigment development in art is very important. It is a direct tool and a means of expression. Pigment makes it possible for the artist to express and communicate his feelings, and further expresses the unique nature of the country, thus leading to a broad consensus. Most of the powder that can be purchased through India, China or Japan is made by coagulating or pulverizing the sediment that has been precipitated to dye. These materials are extracted using artificial chemicals, and they are not produced in a light and transparent color due to their different colors and roughness of the particles. Therefore, it can not be used in inks which are colored by using only fine and fine powder. In the case of indigo blue in the east and west, or a water-soluble color pigment such as a solid liquid which is manufactured and sold by persimmon, blue, etc., a pigment made into a natural side can not be found.

In Korea, natural dyeing using natural fibers is reviving. It is very encouraging that we are trying to restore Korean tradition and beauty. However, pigments have not been developed yet. Pigments and dyes are different from the start. Is a nontriding dye and an insoluble dye. It is first reduced to alkali, oxidized and colored in air, and then returned to its original insoluble color. On the other hand, the pigment used in ink painting should be used directly on paper or silk by dissolving the finished color with water. Pigments differ from dyes. As a result, the dye has a long history as a dye, but no pigment has been developed.

The principle and process of dyeing are summarized as follows. It is necessary to make a sediment by cutting the side-grass and putting hot lye into the bottom sediment and fermenting it at a temperature of 25 ° C for about one week to function as a dye. (A Study on the Silk Dyeing with Natural Indigo Extracted from Polygoum tinctorium -On the fermentation dyeing-, Journal of Sericultural and Entomological Science Volume 40, Issue 1, 1998, pp.78-85). Maintaining this condition for about two years will result in an aged condition that allows for deeper, blue dyeing. Cotton, silk fabric is put into the side of the rubbing out of the rubbing, contact with the air at the moment when the color begins to change and has a unique characteristic of color development. The dyed fabric is dried with lye. If the lye is not removed after drying, the fabric becomes oxidized and becomes unusable. In addition, discoloration and discoloration occur in terms of color. Repeated dying, drying and washing to get blue water is a process of indigo dyeing. Navy blue, dark blue, can only be poured repeatedly more than 40 times. It is known that the finished color after this process has a high flame retardant effect.

However, when painting a picture on a paper, it differs greatly from the above dyeing method. The color must be painted first, the color must be free from light to dark, and the discoloration must be minimized. In addition, it is harmless to the human body of the user or the viewer, and the condition such as not to oxidize the paper base, silk, or cotton fabric based on the pigment. In addition to not being able to repeat the process of drawing and sucking water like silk or cotton fabrics, the range of painting is limited in order to obtain a dark color even if only the paper is dyed. If the paper fiber is lye-free, it becomes weak as well as acidic paper, which causes a serious problem of preservation.

Accordingly, the present inventors have made intensive research to solve the problems of the prior art as described above. As a result, the present inventors have succeeded in making gypsum bubbles as finest powder, drying and adding gypsum to solid matter. When we analyze the state applied to grind and use this solid in a fine dish, it is confirmed that it is finer and finer than ultra fine particles dried with foam, and can freely use subtle changes from light color to dark color when used in traditional or silk, Thus completing the present invention.

The information described in the Background section is intended only to improve the understanding of the background of the present invention and thus does not include information forming a prior art already known to those skilled in the art .

The object of the present invention is to provide a process for producing a natural blue pigment using a side, and more particularly, to a process for producing a natural blue pigment exhibiting an excellent color in water- .

In order to accomplish the above object, the present invention provides a method for producing a water-repellent film, comprising: (a) separating a blue foam after immersing a side- (b) drying the bubble to form a lump and then refining; (c) mixing the purified lumps with water, separating the supernatant, allowing to stand, and then pulverizing the supernatant; (d) mixing the obtained powder with a gelatin solution to obtain a blue solid; (e) removing moisture from the blue solid; And (f) naturally drying the blue solid. The present invention also provides a method for producing a natural blue pigment.

According to the present invention, since the blue pigment made by using the bubbles formed in the step of extracting the pigment using the side is produced by selecting only fine particles, it exhibits excellent color in the case of tinting or bending in Korean painting, has fastness and stability , And it is useful for wide use in the art world in using it as a paint or the like due to its effect of preventing discoloration and insecticide.

1 is a photograph showing the step of immersing the pierced side pool in water.
FIG. 2 is a photograph showing the extracted water after removing the side pool from the water immersed in the side pool.
FIG. 3 is a photograph showing that the extracted water is added with calcium hydroxide and stirred.
Fig. 4 is a photograph showing a step of changing into a blue bubble through a blue bubble.
Figs. 5 to 6 are photographs showing that when the deep blue bubbles are active, blue bubbles are obtained by using a sieve.
Figs. 7 to 8 are photographs showing a dry blue foam. Fig.
Fig. 9 is a photograph showing a state in which a separated foam is dried and processed into a lump shape.
10 is a photograph showing a process (FIG. 10 (C)) in which impurities are removed by dissolving a dry mass of foam in warm water (FIGS. 10 (A) and 10 (B)).
11 is a photograph showing (A) a process of pulverization and (B) a pure powder.
12 (A)), gelatin is dissolved in a hot water (Fig. 12 (A)), and a gelatin solution is added to the powder to mix the gelatin (Fig. 12 (B)) and rod-shaped solid It is a photograph.
Fig. 13 is a photograph showing that the bar-shaped blue pigment dried and finished is wrapped and wrapped in paper, which is a breathable neutral paper.
Fig. 14 is a photograph of a pigment on a white plate for use.
FIGS. 15 to 16 are photographs showing that a paint containing the pigment according to the present invention is colored on paper.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In general, the nomenclature used herein is well known and commonly used in the art.

In one embodiment of the present invention, after the side pool is immersed in water and the side pool is removed and agitated, the blue foam is dried and mixed with water to precipitate the pigment precipitated in the supernatant, And dried to prepare a natural blue pigment.

Accordingly, in one aspect of the present invention, there is provided a method for producing a blue colored foam, comprising the steps of: (a) immersing the (a) side pool in water at room temperature; (b) drying the separated foam to form a lump, followed by washing with water to purify the foam; (c) 200 to 10000 parts by weight of water is mixed with 100 parts by weight of the purified mass, and the mixture is allowed to stand for 20 to 90 minutes. Then, 1/3 to 1/2 volume of the supernatant is separated and left for 1 to 5 days to precipitate Obtaining a coloring matter and drying and pulverizing it; (d) mixing the obtained powder with a gelatin solution at 60 DEG C with stirring, kneading, and then drying to obtain a blue solid; (e) sprinkling the obtained blue solids with powder and leaving it for 7 to 10 days to remove 20 to 40% of water; And (f) naturally drying the blue solid from which the moisture has been removed for 20 to 40 days.

The present invention comprises a step of immersing the (a) side pool in water at room temperature, and then adding calcium hydroxide to the water from which the sidebands have been removed to extract the blue pigment and stirring to separate the suspended blue bubbles.

In the present invention, it may be characterized in that it is immersed in water for 5 to 10 days in the step (a).

In one embodiment of the present invention, in step (a), the side pool is immersed in water (Fig. 1), left at room temperature for 5 days at 25 to 30 ° C, Inducan, a precursor of indigo blue pigment indigo, was allowed to elute into water (Fig. 2). When the slaked lime is poured into the water immersed in the paddy grass and stirred with a rubber spring, the pigment is eluted by the alkali component of the lime (Fig. 3). If the period of immersion in the water in the water is less than 5 days, there is a problem that the indanok component is not dissolved sufficiently and the water can not be extracted. If it exceeds 10 days, it is corroded and bubbles are not generated well. Therefore, it may be characterized in that it is immersed in water for 5 to 10 days, preferably for 5 to 7 days, more preferably for 5 days.

Indigo, which is a blue coloring matter of papaya grass, is insoluble in water. Its precursor, indican, is a glycoside of water-soluble glucose and can be easily eluted from the water by concern with water. Inducans are converted to indoxyl by hydrolysis of glucose by adding alkaline lye, and phosphorus silicate is chemically unstable and oxidized in air to precipitate as a mixture of insoluble indigo and these intermediates.

In the step (a) of the present invention, 100 parts by weight of the side pool is immersed in 200 to 1000 parts by weight of water, and 1 to 3 parts by weight of calcium hydroxide is administered.

If the amount of the slaked lime is less than 1 part by weight with respect to 100 parts by weight of the paddy grass, there is a problem that the blue foam is not generated and the yield of the foam is lowered. Preferably, the water can be administered so as to be in an optimal state in which bubbling occurs while stirring. When the amount of calcium hydroxide to be added exceeds 3 parts by weight with respect to 100 parts by weight of the glue, there is a problem that a lower sediment which can be used as a dye can not be used.

In step (a), the blue pigment is extracted by adding calcium hydroxide, and when stirred, a white foam is generated on the surface, and a white foam is converted into a dark blue foam through a blue foam (FIG. 4). Using the screen, only the above-mentioned blue foam is obtained. After the dark blue bubble is formed, the lime powder is wrapped around the pigment and the foam disappears and becomes transparent. Therefore, it should be obtained before the bubble sinks, when the deep blue foam is strong (Figs. 5 to 6).

The present invention includes (b) drying the separated foam to form a lump, followed by washing with water to purify.

In the present invention, the temperature of the water to be cleaned in the step (b) may be 30 to 50 ° C.

The purification process of the pigment is very important. Unlike water-soluble dyes, pigments should not dissolve in water. That is, when used as a paint, it must have a property of dispersing in water, not in water. Refining is one of the process technologies to maximize this. The foam is dried by pouring water at 30 to 50 DEG C, preferably 40 DEG C, into the dried lumps (Figs. 7 to 9). When the temperature of the water is lower than 30 ° C, the indanone component and the impurities are not separated sufficiently, and they float for a long time. When the temperature is higher than 50 ° C, the saturation of the finished pigment is lowered and the color becomes cloudy and dark. The chemicals that come into contact with the solid surface are washed away and the yellowish water is washed away.

(C) 200 to 10000 parts by weight of water is mixed with 100 parts by weight of the purified lump and allowed to stand for 20 to 90 minutes. Then, 1/3 to 1/2 volume of the supernatant is separated and left for 1 to 5 days Thereby obtaining a precipitated dye, and drying and pulverizing the precipitated dye.

In one embodiment of the present invention, 90 g of purified lumps were dissolved in 4 L of water at about 25 캜. The lumps float on the water at first, and as time goes on they sink into the water. The fine particles loosened in water were filtered using a screening nonwoven fabric 10P, and about 1/3 to 1/2 volume of the supernatant liquid was separated to extract only an aqueous solution containing fine particles (FIG. 10). The blue pigment particles in the water form various layers. To separate only the blue pigment floating on the top is to select only the finest particles. Pigment particles dissolved in water were put in a transparent container and washed with water to wash away the contamination element, and only pure crystals were obtained.

In the present invention, the supernatant is separated in the step (c), water is mixed with the volume of the supernatant separated in the remaining water, and the mixture is left for 20 to 90 minutes. Then, 1/3 to 1/2 volume of the supernatant is separated And allowed to stand for 1 to 5 days to obtain a precipitated dye, followed by drying and pulverizing.

Repeating the above step is to extract only the blue fine particles separated and floating in the upper layer and to remove the dark and heavy impurities that have settled in the lower layer. As the above steps are repeated, the removal rate of the impurities is increased, and the powder of high color saturation and pure color can be extracted.

In one embodiment of the present invention, the separated supernatant was allowed to stand in the natural state for 3 days, and the pigment precipitated in the lower portion was obtained. If the incubation period is longer than 5 days, there is a problem that the period of unnecessary purification is prolonged. Therefore, the incubation period is preferably 1 to 5 days, preferably 3 days. The water in the upper part of the turbid was removed and only the pigment precipitated in the lower part was dried in the shade. The precipitated pigment undergoes a drying process and becomes a solid solid mass. The dried lumps are poured into a mortar or reduced to a fine powder state (Fig. 11). This is to make the pigment with the original powder structure without destroying the molecular structure of the natural foam. The powder has a weak color and a low saturation property as it is finely ground. However, when the same procedure as in the step (c) is performed, the sample becomes a blue color having a high saturation and a clear color (FIGS. 15 to 16).

(D) mixing the obtained powder with a gelatin solution at 60 DEG C by stirring, kneading, and then drying to obtain a blue solid.

In the present invention, the gelatin solution in step (d) may be made of bovine leather.

In one embodiment of the present invention, gelatin prepared in the form of bovine shell was mixed with the obtained powder at 60 DEG C with stirring (Fig. 12 (A)). When the temperature is lower than 50 캜, there is a problem that the proper viscosity and strength are not exhibited and it hardens quickly. When the temperature is higher than 70 캜, the viscosity and the strength become weak and easily corrupt. Is mixed with water at 60 DEG C for mixing. The gelatin solution was prepared by dissolving 10 g of gelatin in 30 g of water. Gelatine was used in all of the world's manufactured products used for painting, but not limited to, the average value of viscosity and strength.

In the step (d) of the present invention, 40 to 60 parts by weight of the gelatin solution may be mixed with 100 parts by weight of the powder.

When the gelatin solution is used in an amount of less than 40 parts by weight based on 100 parts by weight of the powder, the viscosity and strength of the gelatin solution are low. Thus, when the finished solid material is used, it tends to melt and break. When it is higher than 60 parts by weight, the solid material is too strong, There is a problem in that it is not well dispersed when it is used as a pigment.

In one embodiment of the present invention, 5 ml of the gelatin solution was added based on 10 g of the powder. After mixing and kneading, the kneaded powder mass was squeezed for more than one hour (FIG. 12 (B)). This is to remove the oxygen in the dough and increase the bonding strength between powder and powder. The kneaded powder mass was made into a rod shape and naturally dried to obtain a blue solid (Fig. 12 (C)).

The present invention includes (e) sprinkling the obtained blue solids with powder for 7 to 10 days to remove water by 20 to 40%.

In the present invention, the flour may be manufactured by burning rice bran in the step (e), but the present invention is not limited thereto.

In the present invention, 20 to 50 g of ground powder may be sprayed per 100 g of the blue solid in the step (e).

When the powdery powder is less than 20 g per 100 g of the blue solid, there is a problem that the gelatin ingredient mixed with the solid material does not escape well and the solid material is deformed. When the powder is more than 50 g, the shape of the solid material changes due to its weight, There is a problem of sagging.

In one embodiment of the present invention, the rod-shaped blue solids are dried on a wooden board of the shade to the extent of dryness, then placed in a warm (about 40 ° C) ash powder of about 3 cm thickness, After placing the traditional paper, the blue solid was placed on it and covered with paper again (Fig. 13). A warm ash powder was sprayed on the paper covered with blue solids to a thickness of about 3 cm and placed for about 1 to 3 days. This is to stably remove water contained in the blue solid. It is possible to remove a small amount of fat contained in the gelatin and to prevent spoilage and cracking during drying.

In the present invention, the blue solid may be dried to remove moisture of 20 to 40%, preferably 30%. In the shaded area where the wind does not pass, the drying period takes about 7 to 10 days.

The present invention comprises (f) naturally drying the blue solid from which the moisture has been removed for 20 to 40 days.

In the present invention, the step (f) may include drying the blue solid on a ventilating support.

In one embodiment of the present invention, about 30% of the blue solids from which moisture has been removed are naturally dried at about 30 days on a support on which air is communicated. Dry blue pigments are wrapped in a well-ventilated Korean paper and stored in a barrel.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are only for illustrating the present invention and that the scope of the present invention is not construed as being limited by these embodiments.

Example  1: Manufacture of blue foam using side pool

After sowing the seeds and planting them, they bloomed when the flowers began to bloom. The cut-out side pool was filled into an 1100 L container, and water was poured to the top of the container to about 5 cm to prevent overflow (Fig. 1). It was allowed to stand at 25 to 30 ° C for about 5 days, and then scooped out, and then the side grass contained in the water was recovered. At this time, the amount of water extracted was about 2/3 of the volume of the vessel, and as a result, the amount of the pupa was about 1/3 volume (Fig. 2).

Approximately 900 L of the extracted water was poured with 3 kg of lime powder obtained by baking shellfish and chive powder and firing the mixture, and the mixture was stirred with an artificial spring (FIG. 3). This is to increase the contact area so that oxygen is introduced. When the amount of lime powder administered was small, no blue bubbles were observed. Therefore, the lime powder was administered so as to be in an optimal state in which blue foam occurred (Fig. 4). When I poured water, white bubbles began to appear on the surface, and white bubbles soon turned blue bubbles into dark blue bubbles. When the deep blue foam was full, only the suspended foam was obtained using the screen (Figs. 5 to 6). When the lime is added to the lime and stirred, the pigment is extracted by the alkali component of the lime. When the dark blue bubble starts to fade, the lime powder is wrapped in the coloring matter of the side so that the bubble disappears and becomes transparent. It should be obtained when it is strong.

Example  2: Preparation of Natural Blue Pigment Using Foam Containing Side Dye

The blue foam obtained in Example 1 was dried in a windy shade for 3 days to form a lump (Figs. 7 to 9). The dried lumps were washed by pouring lukewarm water at about 40 ° C. The yellowish water is washed off by the chemicals that come into the solid surface. Approximately 90 g of the washed and purified lump was dissolved in 4 L of water at 25 캜 (FIG. 10 (A)). The dried mass initially floated on the water, and loosened as time elapsed (FIG. 10 (B)). The water-soluble particles were filtered using a filter cloth 10P, and about 1/3 of the supernatant was separated to extract only an aqueous solution containing fine particles (Fig. 10 (C)). The blue pigment particles mixed in the water form various layers, and only the blue pigment which is floating on the upper part is separated to select only the finest particles. In order to obtain only pure crystals, the pigment particles dissolved in water were put in a transparent container and the contamination element was washed away with water.

After separating the supernatant liquid, the supernatant liquid separated again into the remaining water was filled with water and left to stand, and the process of separating the supernatant liquid of about 1/3 volume was repeated. This is to remove only the blue fine particles separated and floating in the upper part and to remove the black and heavy impurities which have been seaweed due to the slaked lime in the lower part. As the above steps were repeated, the removal rate of the impurities was increased and the powder of high color saturation and pure color could be extracted. The separated supernatant was allowed to stand for 3 days in a natural state, and the pigment precipitated in the lower portion was obtained. The water in the floating upper layer was yellowish and turbid, and only the turbid water was removed and only the pigment precipitated in the lower part was dried in the shade. The precipitated pigment underwent a drying process to become a solid solid mass (Fig. 11 (A)), which was poured into a mortar or ground to reduce it to a fine powder state (Fig. 11 (B)). The powder of mineral powder has a weak color and a low saturation property as it is finely ground. However, according to the method of the present invention using bubbles, the powder becomes blue specimen having high color saturation and high saturation even when powdered or ground 16).

Gelatin prepared in the form of bark was added to the obtained powder by stirring at 60 캜. Gelatin solution was prepared by dissolving 10 g of gelatin in 30 g of water (Fig. 12 (A)). Gelatine was used as the mean value of viscosity and strength after investigating all the manufactured products of the world used for painting. Gelatin was melted using a pottery bowl and the melting temperature was matched to the temperature at which the collagen was extracted to optimize viscosity and strength. Because the solid blue color is a mixture of protein gelatin, it tends to become rotten during the drying process, so it should be made at a relatively low freezing temperature from the middle of October until the following April.

5 ml of the gelatin solution was added based on 10 g of the obtained powder. After mixing and kneading, the kneaded powder mass was squeezed for more than one hour (FIG. 12 (B)). This is to remove the oxygen in the dough and increase the bonding strength between powder and powder. The kneaded powder mass was made into a rod shape and naturally dried to obtain a blue solid (Fig. 12 (C)). Unlike the remaining rod-shaped pigment of FIG. 12 (C), the first rod-shaped pigment is completely dry, and the different colors are made from the sediment, not the foam. In the case of pigment made from sediment, it was confirmed that the color was not clear and the color saturation was low.

The rod-shaped blue solids were dried to the extent that the adhesive agent that had permeated the surface was dried on the wooden board of the shade, and then warm (about 40 ° C) ash powder of about 3 cm in thickness was laid, The solids were placed and covered again. A warm ash powder was sprayed on the paper covered with blue solids to a thickness of about 3 cm and placed for about 1 to 3 days. This is to stably remove water contained in the blue solid. It is possible to remove a small amount of fat contained in the gelatin and to prevent spoilage and cracking during drying. The blue solids left for 1 to 3 days were spread out on a flat board in a shaded area where the wind did not pass and were often turned over and rolled to form a balanced and straight shape. The blue solids were dried for one week in a shaded area without water to remove about 30% of the moisture. When 30% of water is removed, it is placed on a supporting platform where air is circulated and dried naturally for about 30 days.

Example  Preparation of paints containing natural blue pigment using 3:

The blue pigment dried and completed in Example 2 was wrapped in Korean paper, which is a breathable neutral paper, and stored in a wooden barrel (Fig. 13). Figure 14 shows that the pigment is ground on a white plate for use as a paint. As a result of coloring on paper using the above-mentioned paints, it was confirmed that the coloring degree was excellent, and fine and fine particles were used, and that subtle changes from light color to dark color were freely available (FIG. 15).

As a result of observing the colored paper with a microscope, it was confirmed that fine and fine water-soluble pigments suspended in the upper part penetrate into the pores between the fibers of Korean paper to have a clear color, high color saturation and homogeneous dispersion 16). In addition, it was confirmed that no discoloration or discoloration occurred after passage of several decades after the coloring.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will appreciate that such specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereto will be. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.

Claims (10)

Process for the preparation of natural blue pigments using a side containing the following steps:
(a) immersing the (a) side pool in water at room temperature, and then adding calcium hydroxide to the water from which the sidebands have been removed to extract the blue pigment and stirring to separate the suspended blue foam;
(b) drying the separated foam to form a lump, followed by washing with water to purify the foam;
(c) 200 to 10000 parts by weight of water is mixed with 100 parts by weight of the purified mass, and the mixture is allowed to stand for 20 to 90 minutes. Then, 1/3 to 1/2 volume of the supernatant is separated and left for 1 to 5 days to precipitate Obtaining a coloring matter and drying and pulverizing it;
(d) mixing the obtained powder with a gelatin solution at 60 DEG C with stirring, kneading, and then drying to obtain a blue solid;
(e) sprinkling the obtained blue solids with powder and leaving it for 7 to 10 days to remove 20 to 40% of water; And
(f) naturally drying the blue solids from which the moisture has been removed for 20 to 40 days.
The process for producing a natural blue pigment according to claim 1, wherein the step (a) is carried out in water for 5 to 10 days.
The method for producing a natural blue pigment according to claim 1, wherein in step (a), 100 parts by weight of the side pool is immersed in 200 to 1000 parts by weight of water and 1 to 3 parts by weight of calcined lime is administered.
The method according to claim 1, wherein the temperature of the water to be cleaned in step (b) is 30 to 50 ° C.
2. The method according to claim 1, wherein the supernatant is separated in step (c), water is mixed with the volume of the supernatant separated in the remaining water, and the supernatant is allowed to stand for 20 to 90 minutes. Separating and leaving for 1 to 5 days to obtain a precipitated pigment, and drying and pulverizing the obtained pigment.
The method according to claim 1, wherein the gelatin solution in step (d) is made of bovine leather.
The method for producing a natural blue pigment according to claim 1, wherein 40 to 60 parts by weight of a gelatin solution is mixed with 100 parts by weight of the powder in the step (d).
The method for producing a natural blue pigment according to claim 1, wherein the flour in step (e) is produced by burning rice bran.
The method for producing a natural blue pigment according to claim 1, wherein 20 to 50 g of ground powder is sprayed per 100 g of blue solid in step (e).
The method of claim 1, wherein in step (f), the blue solid is dried on a ventilating support.

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