Methyl violet

Its main use is as a purple dye for textiles and to give deep violet colors in paint and ink.

Methyl violet 2B (IUPAC name: 4,4′-((4-Iminocyclohexa-2,5-dien-1-ylidene)methylene)bis(N,N-dimethylaniline) monohydrochloride) is a green powder which is soluble in water and ethanol but not in xylene.

The protonated form (found in acidic conditions) is yellow, turning blue-violet above pH levels of 1.6.

Oxidation can destroy the dye completely, e.g. through the use of sodium hypochlorite (NaClO, common bleach) or hydrogen peroxide.

[7][8] Light alone does not rapidly degrade methyl violet,[9] but the process is accelerated upon the addition of large band-gap semiconductors, titanium dioxide or zinc oxide.