Blue ＃2

品目信息

Blue ＃2 品目信息
Synonyms	Indigo carmine Acid Blue 74 indigocarmine Indigotindisulfonate sodium Indigocarmin Indigotine C.I. ACID BLUE 74 FD&C Blue No. 2 Sodium 3,3'-dioxo-[2,2'-biindolinylidene]-5,5'-disulfonate
Description	FD&C Blue #2 is a colorant. It has poor ph stability in that after 1 week at ph 3 and 5 it will appreciably fade, at ph 7 considerably fade, and at ph 8 fade completely. It is the least soluble of all food colors, with a solubility of 1.6 g in 100 ml of water at 25°c. Complete fading occurs in alkalis such as 10% sodium carbonate and 10% sodium hydroxide, with fading also occurring in 10% sugar systems. It has very poor light stability and oxidation stability, and moderate stability to heat; it has a deep blue hue with poor tinctorial strength. It is the only food color that has good resistance to reducing agents, but has very poor compatibility with food components. The major use is in pet food, but it is also used in candies, confections, and baked goods. The common name is indigotine.
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