Hi all, Hope everyone had a great holiday! I finally have some free time and have been organizing and filing my fathers many negatives (35mm through 4x5) from the 20's through the 50's which I've been wanting to do for a long time. My question is this...is there a (chemical etc.) test for determining which emulsions are nitrite based or not? Some of these films have names like Agfa Supreme Pan, Ansco Superpan Press and Agfa Superpan Press, but most are unmarked. The ones marked Safty film I know are non-explosive. It is interesting as well as emotionally cathartic to see my fathers life from so long ago in great detail with the actual negs. It brings to mind that all of our lifes work after we have passed will naturally enter into the realm of catagorized historical documentation.If not somewhere else. Peace.