As the other posters said, same as 35mm. I always use hardener in my film fixer to guard against scratches. Make sure you're using the right amount of PhotoFlo--1 small capful to 20 ounces--agitate for :15 to :30, then hang 'er up and let 'er buck. Never touch the wet film emulsion with anything; it gets enough crap in it by itself.(posted 8863 days ago)