出典:Wikipedia
出典:『Wikipedia』 (2011/05/13 05:11 UTC 版)
Azo violet is an organic compound with the chemical formula C12H9N3O4. It is used as a dye and a pH indicator. It forms blue colour with magnesium in slightly alkaline medium. This reaction depends on adsorption of the dye on magnesium hydroxide. Ammonium ions reduce sensitivity of reaction.