Looking through Wall & Jordan's Photographic Facts & Formulas, I came across a comment about physical development which is very intriguing. "It results in a very fine grained image, regardless of the size of grains in the emulsion." This makes sense, knowing that in physical development the silver is deposited/supplied from the developer solutions, not the emulsion silver itself. Quote, "In this process a silver salt is combined with a reducing agent in the developer, and the action is to precipitate silver on the latent image, rather than to reduce the silver in the emulsion as is done bye chemical development." What seems most intriguing is the prospect of physical development of fast films; the 400 speed films of course, but better yet the 3200 variety. The book mentions some difficulties, such as the contrast of the negative cannot really be affected, which might suggest that pushing is not an option. Furthermore, the process itself sounds quite critical and requires silver nitrate. Furthermore-more, another section which addresses physical development of lantern slides says that speed is cut in half, though this is a different formula as well. All told though, I'd love to see what could be done. What would fine grained Delta 3200 look like?? Anyone ever done this, seen it or feel like doing it?