After many years of tray development, I finally took the suggestions of many and tried drums. Gosh! My negs have never looked better--especially the 7x17s. I have done a half-dozen each in 3 formats, using 8x10, 11x14, and 16x20 drums. The results, on Efke PL 100 M, *look fine*. But wait. I used to fuss about carrying over 10 drops of one solution into the next 4 liter tray. Now I see 5 times that amount going into 1/60th solution, that no amount of shaking and gyration can remove from the drums. I foresaw that problem and follow each solution with a greater than recommended (> 2 oz. for 8x10; > 8 oz. for 16x20) distilled water rinse. My drums come with instructions for printing color, and I have read several "how to" posts here in the forums, but I have a nagging question. What should I be doing about time and volume (and ? number) of rinses between development steps to insure that these great looking negatives are, in fact, archivally processed, and don't stain, mottle, or crud up sometime down the road?