Specification :

Yellow uniform powder. Soluble in cold water, soluble in hot water was bright yellow, soluble in ethanol, yellow, aqueous solution when the temperature exceeds 70  , dye is broken down into 4-methyl benzophenone, its aqueous solution by adding concentrated sulfuric acid was colorless, pale and diluted yellow. In concentrated nitric acid in the orange. Hydrochloric acid solution plus its turn yellow, or colorless when heated to boiling; plus sodium hydroxide solution generated a white precipitate. Dye on the silk fiber was Yan yellow, red in incandescent light, more.