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Is Azo Violet vegan?

Azo Violet (Magneson I; p-nitrobenzeneazoresorcinol) is a synthetic azo compound used as a violet dye and as a pH indicator, appearing yellow below pH 11 and violet above pH 13. It also forms a deep blue colour in the presence of magnesium salts in a slightly alkaline environment and is used analytically to detect beryllium and ammonium ions.

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