I have a large roll of 9.5" Kodak Aerographic Duplicating film, expired in '94 but I used it about 3 years ago and seemed quite fine. I'd like to make enlarged negatives for VDB as my largest format is 4x5. I have enlarged negatives before by making an interpositive and while this worked, it was tedious and very hit or miss. I wasted a lot of materials and the entire process did not seem so easily repeatable for me. On UnblinkingEye, there is an article entitled 'Negatives by Reversal/Less is more'. http://unblinkingeye.com/Articles/NbyR/nbyr.html Is anyone using this method? I have a decently small amount of potassium dichromate, 10% and some Kodak Film Hardner (scrounged from a Kodak Royal Print Fixer kit) which contains mostly sulfuric acid. Any tips or hints otherwise? I've never tried anything like this but thought I'd ask before I go ruining all my pot. dichromate.