MATHEMATICAL BLEACHING MODELS FOR PHOTOGRAPHIC 3-COLOR MATERIALS

Photographic three-color materials possess poor stability when exposed to light, chemicals, heat, and humidity. As a consequence, the color of photographs deteriorates with time. Because of the irreversibility of the processes causing the dyes to fade, it is impossible to restore the images by chemical means. Accelerated fading tests of different c olor slide films, color negative films, and color papers were carried out. The results of this investigation show that a simple mathematical model describes in most cases the bleaching of color photographic mat erials.