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Crystal growth from the aqueous solution was examined for KCl and KI. By a gradual decrease of the temperature of the solution, new crystal layers are grown onto a seed and they attain a thickness up to a few millimeters in the course of several weeks. The ultra-violet absorption of as-grown crystals gives no indication of the incorporation of OH- ions, and the F-band which is induced by X-ray irradiation at room temperature scarcely shows the distinction between the first and second stages of coloration. Along with the ionic conductivity of crystals and the additive coloration by alkali metals, it is suggested that concentrations of impurities are, in general, lower in solution-grown crystals than in melt-grown crystals.

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