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#11
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Spots!
Donald Qualls wrote: Chris Loffredo wrote: Thanks for the various comments. It is not a problem with the camera(s). Before I start using distilled water for everything (or risk more film experimenting), could it be the that I used the wetting agent in too high a concentration (didn't have any accurate measuring vessels on the order of 1cc)? Not very likely that tiny spots are from wetting agent -- I've seen that spot, but the spots are typically 2-3 mm across with more density at the edge than the center, like what you'd see if soapy water dries on a mirror (soapy water is exactly what the wetting agent treated wash is, of course). Tiny spots like you describe could come from dust that got on the film while drying (though that's more likely to come as tiny threads in most locations), dust in the enlarger or scanner, very localized increased development (can happen if you mix your developer and didn't get the alkali fully dissolved; remaining crystals of alkali will accelerate development locally whereever they come to rest by raising pH), or even a film defect (junk in the emulsion from the factory). If they print white, however, you can rule out pinholes, air bubbles in the developer causing local underdevelopment, and dust in the camera at exposure. -- I may be a scwewy wabbit, but I'm not going to Alcatwaz! -- E. J. Fudd, 1954 Donald Qualls, aka The Silent Observer Lathe Building Pages http://silent1.home.netcom.com/HomebuiltLathe.htm Speedway 7x12 Lathe Pages http://silent1.home.netcom.com/my7x12.htm Opinions expressed are my own -- take them for what they're worth and don't expect them to be perfect. I'm not so sure about pinholes always printing black. Fine scratches print as black if they are on the film side. Perhaps looking at the negative through a microscope would give a clue. Even the 30 power pocket microscopes sold by Edmund and Radio Shack are helpful. Get one that is self illuminating when used with reflected light. Things on transparencies look different under reflected light, so you may be able to see whether the pinpoints are in the emulsion or in the film. |
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