ABSTRACT
Photoadaption is a term that was adopted to describe the effect of various light exposure protocols on glasses that are considered to be nominally photochromic glass; that is, they possess a thermally developed Ag halide phase that responds to light by darkening and fading in a reversible manner, as discussed in Chapter 5. This chapter describes an additional optical phenomenon related to the photochromic effect, or more precisely, to glasses that contain a thermally developed Ag halide phase. This photoadaption was initially observed when certain photochromic glass compositions that were exposed to UV light and then exposed to light of a wavelength (subsequently or simultaneously) that was within the UV-induced absorption band (400– 700 nm) resulted in a color modification.
