Spectral absorbance of CrCl3-MCl2-water system was studied by dye indicator method using eosin as a dye. In this method, keeping the concentration of dye and concentration of MCl2 type of salt is constant with increasing concentration of CrCl3 solution absorbance was measured, showing corresponding complex ion formation in the ratio of 4:1, 2:1, 1:1, 2:3, 1:2.