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nature : appearance of brown powder, water-soluble products were red, dissolved in 30% ethanol, glycerol and dilute saccharin, pure alcohol-soluble and-fibrinolytic, do not dissolve in organic solvents. Case of concentrated sulfuric acid was purple, peach was diluted red and met concentrated nitric acid solution was bright red and met with concentrated hydrochloric acid solution was brown and black produce precipitation. Their solution was concentrated hydrochloric acid case of the Red goods that had concentrated sodium hydroxide solution was reddish brown. LD50 rats by intraperitoneal injection of �1000 mg / kg, ADI0 - 0.75 mg / kg. From 1-naphthylamine 4-acid diazotization Wang, R salt coupling is derived refined. For food and food flavor, various formulations of drugs and cosmetics such as a colorant.
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