yellow red. From the glacial acetic acid in the crystallization of red needle product melting point is 269 ℃. In concentrated sulfuric acid to purple, dilution after red precipitation; In 10% of the sulfuric acid insoluble; In concentrated hydrochloric acid of insoluble; In concentrated nitric acid for wine solution; In 10% sodium hydroxide solution insoluble.
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Standard
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Light Fastness
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Heat-resistant(℃)
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water
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Sodium Carbonate(5%)
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Hydrochloric acid(5%)
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Melting point
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Stable
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ISO
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