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Methyl violet is the name given to a group of similar chemicals used as pH indicators and dyes. Methyl violets are mixtures of tetramethyl, pentamethyl and hexamethyl pararosanilins. By blending the different versions, the dyemaker can create different shades of violet in the final dye. The more methylated the compound (the more methyl groups attached), the deeper blue the final color will be:
Additional recommended knowledge
The main use of methyl violet (by sheer volume used worldwide) is to dye textiles purple and give deep violet colors in paints and printing ink.
Methyl violet 2B (simply called methyl violet) is used in chemistry as a pH indicator to test pH ranges from 0 to 1.6. At the acid end of its measuring range, it takes on a yellow color. At the alkaline end, it becomes bluish-violet. Methyl violet can be supplied as premade pH testing paper, or it can be supplied as pure crystals and dissolved in the sample being checked.
In medicine, Methyl Violet 10B is known as Gentian violet and is the active ingredient in Gram's stain, used to classify bacteria. Gentian violet destroys cells, and is used as a moderate-strength external disinfectant. Gentian violet is very poisonous to most animals, dogs and cats included — do not use it as a disinfectant for animals' skin.
Methyl violet has also the ability of binding DNA. Therefore, in biomedical sciences, it is used for cell viability assays. The binding to DNA can also cause disruption in DNA replication process, which can lead to mutations and cancers.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Methyl_violet". A list of authors is available in Wikipedia.