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Crystal violet, a triphenylmethane dye, is used to dye ink and textiles.

Trimethylaniline, triphenylmethane and mononitrophenol are a few examples which happen to occur to the memory, and they are by no means the longest or queerest-sounding.

E. and O. Fischer showed that these compounds were derivatives of triphenylmethane and tolyldiphenylmethane respectively.

The reverse series of operations was also carried out by the Fischers, triphenylmethane being nitrated, and the nitro compound then reduced to triaminotriphenylmethane or paraleucaniline, which on careful oxidation is converted into the dye-stuff.

It is evident, from what has been said, that rosolic acid and its related colouring-matters are members of the triphenylmethane group.