Carmine is red to dark red uniform particles or powder, odorless. It has good light resistance and acid resistance, strong heat resistance (105℃), poor reduction resistance; poor bacterial resistance. It is soluble in water, and the aqueous solution is red; it is soluble in glycerol, slightly soluble in alcohol, and insoluble in oil; the maximum absorption wavelength is 508nm±2nm. It is stable to citric acid and tartaric acid; it turns brown when it encounters alkali. The coloring properties are similar to amaranth.
Carmine is also called magenta. It is a water-soluble synthetic pigment with bright yellow-red color and single-color variety. It can be safely used for coloring food, beverages, medicines, cosmetics, feed, tobacco, toys, food packaging materials, etc. It is a red prismatic crystal obtained from ethanol, with no obvious melting point, and turns black at 120°C. It is dark red in water; it is yellow to purple in acidic solution. It is soluble in water, ethanol, glycerin, and concentrated sulfuric acid, slightly soluble in ether and ethanol, and almost insoluble in petroleum ether, benzene, chloroform, and oil. There is no poisoning phenomenon in animal experiments. There are many types of carmine, such as
Food Coloring, dyes, etc.
A tropical female cochineal is dried, ground into powder, and carmine is extracted. It is then treated with alum to remove impurities to make carmine. Pure carmine cannot be dyed, and it must be dissolved in an acidic or alkaline solution before it can be dyed. Commonly used acidic solutions include glacial acetic acid or picric acid, and alkaline solutions include ammonia water, borax, etc. Carmine is an excellent dye for cell nuclei, and the stained specimens are not easy to fade. It is suitable for dyeing slices or tissue blocks, especially for the overall dyeing of small materials. The solution prepared with carmine can be kept for several years after dyeing. When the carmine solution is turbid, it should be filtered before use.
Carmine can be used as a food pigment for coloring foods such as fruit juice drinks, prepared wine, carbonated drinks, candies, cakes, ice cream, yogurt, etc., but cannot be used in foods such as dried meat, meat products, and aquatic products. It is mainly to prevent some lawless elements from using pigments to cover up the appearance of bad raw meat such as spoiled meat and deceive consumers.
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