Hi all, I've noticed that most of my home processed b&w films will get tiny scratches rather sooner than later. They are only on the base side, never on the emulsion and visible only under 50x magnification (enlarger set to produce 13x18cm and looking through 10x focusing-aid magnifier) or/and looking along film base in reflected light. This happens apparently after first-second printing session, even if I place negative in glassless carrier extremely careful without single move (and they're in the middle of the frame mostly), or scanning (though I seldom scan b&w negs so can't be so sure). I suspect the source of problem are tiny pieces of dust, hair (not a big) or whatever is found in the air. Usually I use soft brush and compressed air to remove any spec of dust that I find on the film. On the other hand, I noticed that none of my slide films (I don't mount them and keep them in the same sleaves as negatives) don't have this problem, neither do C-41 negatives (color and b&w). Is film base of slides and C-41 negatives more robust than of silver films? Have you experienced same problem? How did you resolve it? I'm thinking about starting to use sodium thiosulfate fixer with hardener for films (now I'm using Ilford Rapid Fixer). Will it help?