Method for coloring lac and acid lac alcohol solution
A shellac and solution technology, applied in the field of shellac and its alcohol solution for coloring, can solve the problems of coagulation, precipitation, uncolorable pigments, unusable use, etc.
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Embodiment 1
[0022] Embodiment one: red gravure printing ink
[0023] microcrystalline cellulose
[0024] Stir and mix microcrystalline cellulose, purple cabbage extract pigment solution and citric acid to make the pH value 2.5-3. Mix the whole evenly, put it into the pre-dissolved shellac alcohol solution and mix thoroughly, and filter properly as needed to remove excessively long cellulose. The pigment solution obtained in this way ensures stability and does not cause deterioration of the ink.
Embodiment 2
[0026] Norbistin Potassium Salt Solution
[0027] Stir and mix norbiscus potassium salt solution and microcrystalline cellulose, slowly pour into the shellac solution dissolved in ethanol in advance and mix, then add propylene glycol and mix. The ink for screen printing made in this way will not deteriorate with the shellac alcohol solution, and the potassium salt of noranthin can stabilize the orange color.
Embodiment 3
[0029] Aqueous solution of carmine acid
[0030] Add sulfuric acid to the carminic acid aqueous solution to make it acidic, add microcrystalline cellulose to make a lump, add it to the shellac alcohol solution, stir and disperse, and obtain a red paint.
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