Alkaline swells the film gelatin coating and an acid stop contracts gelatin. Using an acid stop preserves an acid fix and was need when papers required hardening due to ferrotype drying techniques. The modern fix method is to use a neutral or alkaline fix like TF-4. A couple of Saint Ansel methods are out of date such as his fix and toning routine. Regarding washing, David Vestal discovered the amount of water is not critical. A surprizing small amount of water is required to diffuse hypo out of the paper. Follow Ilford's directions for processing. Be mindful of fixing around 10 to 12 8x10 prints per L unless using a two fix method.
The Film Developing Cookbook mentions that Sodium Thiosulfate is no longer recommended to fix contemporary photographic materials. Materials changed and we know more since Ansel authored his books.
Last edited by Richard Jepsen; 02-19-2008 at 10:04 PM. Click to view previous post history.