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Chemical compound.

1
The action of acid is equally characteristic for methyl violet.
Scientific American Supplement, No. 363, December 16, 1882
2
A good ink may be made of methyl violet 2 parts, alcohol 2 parts, sugar 1 part, glycerine 4 parts, and water 24 parts.
The Boy Mechanic, Volume 1: 700 Things for Boys to Do