Fay, Irving W. (Irving Wetherbee), 1861-1936 · New York, D. Van Nostrand Co. · leaf 116
THE TRIPHENYLMETHANE DYES 105 form water; but by a rearrangement of valences, it becomes joined to a nitrogen atom. This arrangement, known as the quinone structure (because it occurs in the substance quinone), is shown below: … The salt or the dye malachite green From the solution in which the dye was formed it is pre- cipitated by zinc chloride and common salt, whereby the double salt of the dye and zinc chloride is formed. This, being insoluble in a salt solution, falls as a precipitate. It is filtered off,…
Coal-tar colors · Dyes and dyeing
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