Historic 1940s Film on Processing Film

This 70 year old film by the American Chemistry Society documents how motion picture film was processed in the 1940s. The movie covers B&W film, since colour processes were new to the era and possibly proprietary, making them harder to document. Note that film today no longer requires alum in the fixer solution, because film is now made tolerant of higher temperatures. Otherwise, developing colour films would be impossible due to the higher temperatures used in processing such films.

Well worth the half hour to watch.