Successive Electronmicroscopic Observation of Coloured and Bleached KCl Crystal

Abstract

The surface changes in a given part of the same KCl crystal during colouration by X-rays and in the process of bleaching by natural light have been successively observed by using two-stage replica. A slightly modified Bradley’s method was used for making two-stage replica. By this method, the surface change at the definite position of the same KCl crystal was observed successively. According to the present results, it has been clearly confirmed that crystallites grown on the KCl crystal during X-ray colouration disappear during bleaching through the process quite reverse to the crystal growth in colouration and that the behaviour of the crystal growth and its disappearance are not simple, but very peculiar. Results obtained have been briefly discussed.