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Pigment Blue 15:1

Solubility: insoluble in water, soluble in ethanol to blue, in concentrated sulfuric acid is brownish yellow,
In dilute sulfuric acid for red light yellow, adding sodium hydroxide in aqueous solution has a red-brown.

Dark-blue powder. Slightly soluble in water, soluble in hot water is blue, blue is soluble in ethanol.

In concentrated sulfuric acid, a brown-yellow, is light green to blue in a dilute sulfuric acid, aqueous NaOH Brown flock.
Blue powder, heat resistance, alkali resistance and Water_soluble good.

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