1. As a food colorant, China's regulations can be used in red and green silk, the maximum use is 0.20g/kg; In fruit juice (flavor) drinks, carbonated drinks, confectionery, pastries, colored cherry cans (decoration), green plums, the maximum use of 0.10g/kg; The maximum usage in impregnated vegetable is 0.01g/kg. Food blue pigment. Generally used for color mixing. Because of its instability, low fastness and weak dyeing, it is most suitable for dark tones. Can be made into chocolate color, green, red bean color, tea color, coffee color. 5 ~ 100mg/kg for cake, cold drink and cool beverage. Used as oxidant reduction indicator and biological staining agent, also used for determination of renal function and coloring of food, medicine and daily cosmetics. Edible indigo is a synthetic edible pigment. Food pigment is a kind of additive used in food coloring, including synthetic pigment and natural pigment, there are more than 60 kinds in total.

The name of the
Chinese name: indigo carmine
Chinese alias: acid indigo, soluble indigo, indika red, indigo disulfonate sodium
English alias: Indigo carmine, IndigotindisulfonateSodium Indigotine, Acidblue74 Solubleindigoblue, Indigosoluble, Carmineblue, Indigocarminesodiumsalt, Sodiumindigotindisulfonate
Chemical formula
C16H8N2Na2O8S2
Relative molecular mass
466.37
character
Dark blue powder with a coppery luster. It's sensitive to light and oxidants. At 25℃, 1g is soluble in 100mL water, slightly soluble in ethanol, almost insoluble in other organic solvents. Easy to be nitric acid, chlorate fade, its aqueous solution storage for a long time can also fade. Maximum absorption wavelength 608nm. The median lethal dose (rat, iv) was 93mg/kg.
storage
Store in a cool, dry seal away from light.