A friend of mine recently gave me a 35mm film bulk loader from a darkroom that closed down at her school. There is film in it and on the bottom it is labeled direct reversal duplicating film. When I opened the compartment with for the cassettes i saw that the film was red and almost completely transparent. I have had a hard time finding a clear definition of what it is from google so I came here. I hope this is the correct category. What is this film? And how can I use it? Thanks.