I've been doing C-41 processing for about a year (a few dozen rolls total) and have recently run into a problem: On three of my last four rolls (all 35mm), there are small flaws in the emulsion. Here's a sample scan from an affected negative, as scanned at 2700 dpi (219x192 crop; it's not huge) with a Minolta DiMAGE Scan Elite 5400: http://www.rodsbooks.com/flaw.jpg This scan's colors have been reversed, so the flaw shows up as a black spot. Looked at under a loupe, it looks as if the emulsion has flaked away. I've never encountered this problem before. The films are all different types (Kodak BW400CN, Agfa Vista 200, and Kodak Portra 400VC). They were processed in two batches (the BW400CN in the first, the Agfa and Portra together in another batch), with one intervening roll that didn't exhibit the problem (another Agfa Vista 200). All were processed in Paterson Photocolor II developer with Kodak bleach and fixer. I've been replenishing the bleach but the developer was fresh for the bad rolls (that is, freshly mixed from the same original bottle). I use a manual stainless steel tank (no machine processing) and a water bath to control temperature of the chemicals. For washes between steps, I use flowing tap water at hand-judged temperature. So, any ideas what might be causing this problem? I've got several, such as bad bleach and temperature-control problems during washes, but I thought I'd ask for advice here before experimenting on my next few rolls. Thanks.