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The UV absorption of KCl crystals grown at different rates from aqueous solutions containing SnCl2 and PbCl2 in various concentrations was investigated as a function of the concentration of dopants built-in into the crystal. With increasing dopant concentration characteristic changes were observed in the absorption spectra at about 10−2 mole% concentration in the case of the non-isomorphic Sn dopant, and at 2×10−1 mole% in the case of the isomorphic Pb. The changes indicate that the manner in which the dopants are incorporated into and distributed within the crystal differs from that at lower dopant concentrations.