Quote Originally Posted by Photo Engineer View Post
All film emulsions change with time. The shift has nothing to do with the dye forming reaction itself. It does not even matter with regular color films.

This is why B&W paper and film change!


That makes sense; any fog already present on the film will cause the dye forming reaction to go AWOL and render a different colour, dependent on which colour-sensitive layer of the film is fogged? (with regards to Kodachrome)