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nature : also known as acid red 3R, "Dye Index" (CI) is called food-7 (16,255). Dissolved in water, glycerol, ethanol-soluble hard, do not dissolve in fat. Animal experiments without poisoning phenomenon. Brown met alkali change. For food, pharmaceuticals, cosmetics coloring. From 1,4-naphthalene amino acid by diazotization after salt and G (G salt, or beta-naphthol 3,5-disulfonic acid in sodium or potassium salt) in alkaline medium coupling in the system.
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