High Quality Content by WIKIPEDIA articles! Chromium(III) chloride (also called chromic chloride) is a violet coloured solid with the formula CrCl3. The most common form of CrCl3 sold commercially is a dark green hexahydrate with the formula Cl.2H2O. Two other hydrates are known, pale green Cl2.H2O and violet Cl3. This unusual feature of chromium(III) chlorides, having a series of z+, each of which is isolable, is also found with other chromium(III) compounds.