dark red light orange. Insoluble in water, soluble in ethanol, acetone and benzene. In concentrated sulfuric acid to orange, dilution after yellow orange.
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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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Poor
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Insoluble
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