Df. Kopperl et al., SOME CONSIDERATIONS AROUND THERMAL YELLOWING OF COLOR NEGATIVE AND REVERSAL PAPERS, Journal of imaging science and technology, 42(2), 1998, pp. 153-154
Thermal yellowing refers to the dark-keeping increase of blue density
in D-min and low/mid density areas of color negative and reversal prin
ts such as that which occurs with album storage of prints. Arrhenius t
esting is normally used to predict the time to reach a specified amoun
t of yellowing. Recently generated data show that not only the rate of
stain but also the maximum amount of stain, is temperature dependent.
At 20 degrees C the maximum stain for a typical color negative paper
is predicted to be 0.09 Status A blue D-min increase.