Abstract
Cation colloidal particles in additively colored CaF 2 crystals have been bleached with light in the colloidal band. At 360 K the colloid band decreases and a new band in the near i.r. region is created which is probably due to highly coagulated F-centers. At 430 K the colloidal band is destroyed at the same time that a band appears at 383 nm. This band has been tentatively associated to a kind of F-center. Photochromic conversions between colloids and i.r. bands at 360 K and between colloids and 383 nm band at 430 K have been obtained. A mechanism for the bleaching of colloids has been proposed.
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