[old_tv_nut]

The Permanence and Care of Color Photographs (by Wilhelm and Brower, 1993) says that the early version of Kodachrome, used from 1935 to about 1940, used a controlled-diffusion bleach development, and had poorer dark stability. They show an example from 1939 that has faded toward magenta, and has almost no yellow dye. They say the later selective exposure development process introduced in 1938 had excellent dark stability. They also say that both Kodachrome based print processes had excellent dark stability. After 1955, the name Kodachrome print was still used, but the print process was done via a Kodacolor type of internegative and negative printing paper, so stability was no better than color negative prints.