Crystal violet > Ethyl violet
The preparation of crystal violet is a very popular experiment in the organic chemistry education because the strong dying effect enforces very clean working conditions. Unfortunately in the meantime the starting material michlers ketone has been classified to be carcinogenic. But instead of crystal violet ethyl violet can be prepared in exactly the same way (see FU Berlin experiment 6-10). Both educts michlers ethylketone und Diethylaniline are not carcinogenic.