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Eriochrome Black T
Dark brown powder. It is soluble in water and is Zao red to oar red; slightly soluble in alcohol and brownish pinkish red; slightly soluble in acetone. It is dark blue in concentrated sulfuric acid, light red brown after dilution, and orange yellow in concentrated nitric acid. There was no significant change in the aqueous solution and concentrated hydrochloric acid; the concentrated sodium hydroxide solution turned brown and magenta. The solubility in water (90 ℃) is 25g / L. When dyeing, copper and iron are encountered, and the color light has great influence.
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