Color Index Acid Violet 13 is a chemical compound belonging to the azo and acid dye classes. It is a chromotropic dye originally used for dyeing wool.
Synthesis Acid Violet 13 is synthesized via the diazotization of 1-aminonaphthalene using sodium nitrite and hydrochloric acid, followed by azo coupling of the resulting diazonium salt with chromotropic acid.
Use Acid Violet 13 is used to dye wool in a reddish-violet shade. The addition of chromium salts, such as potassium dichromate, during the dyeing process induces a distinct color shift from reddish-violet to blue-black.
History The production of the dye was patented by Hoechst in 1890. As with other chromotropic acid-based dyes described in the patents, its application in wool printing is particularly emphasized.
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