Actinic Degradation Chemical degradation, such as Oxidation, of a material due to exposure to Ultraviolet radiation from sunlight or other sources I know that it is two words but the meaning joins them together. When I was doing aerial despatch we had to keep strops with any nylon content in light proof bags an instructor who quoted this daily. He had an unfortunate twist to his mouth so by him speaking the words made his face distort in a most peculiar way.
