orange. Melting point of 165 ~ 166 ℃. Soluble in water for orange, soluble in ethanol, acetone and Cellosolve. In concentrated sulfuric acid to yellow, to orange after diluted; In concentrated hydrochloric acid for red solution, and then into orange. Dye aqueous solution to join hydrochloric acid to red solution; Add sodium hydroxide have yellow precipitation
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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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165～166
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130≥162
Sublimation
|
Well
|
Well
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Poor
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