The Coloration of Glass by X-Rays

JSGT 1929 V13 T279-T285

There are three types of radiations – solar, radium, and Roentgen – which have been observed to cause colour changes in glass. The effect of sunlight was probably noted in ancient times; the more pronounced changes induced by radium and X-rays were perceived soon after the discovery of these radiations.

C. W. Parmelee, G. L. Clark & A. E. Badger