Photochromism

Name:
Photochromism
Detailed information:
The ability of a transparent material to darken reversibly when exposed to light. Plastics can be made light-sensitive by certain aromatic organic nitro compounds such as 2-(2,4-dinitrobenzyl)pyridine. Such chemicals are compatible with most transparent plastics and are either blended with the base resin or applied as coatings. See Glass, Photochromic.