Is Phenylene brown vegan?

Basic Brown 1 is also known as Phenylene brown.

Bismarck Brown Y (Basic Brown 1) is one of the earliest synthetic azo dyes, first described in 1863 by German chemist Carl Alexander von Martius and named after Chancellor Otto von Bismarck. It is a diazo dye used in histology for tissue staining and in textile dyeing.

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