These days many people use digital cameras primarily and shoot film occasionally. For those who develop our own b&w film, the liquid solutions may expire before we use them up. Powdered chemicals usually keep longer than liquids. Many years ago (1930s, '40s), Kodak sold small one-shot tubes of powdered film developer and fixer for snapshooters who mixed them with water immediately before use. Can we devise a similar method today? Using a pH-neutral fixer, we could eliminate the acid stop bath (acetic or citric) and a hypo-clearing agent. The only liquid chemical to stock would be the final-step wetting agent, a small bottle that keeps practically forever. Questions: Which powdered film developer, and which powdered fixer? Both powders must be easy to measure in quantities small enough for one-shot developing one or two rolls of b&w film. Measuring such small amounts often isn't recommended for formulas having many ingredients because it's possible that their balance will vary beyond specifications. This drawback favors formulas having few ingredients. The simplest film developer is Kodak Formula D-23, which I think dates from the 1920s. It's simply metol and sodium sulphite. Although used today mainly by large-format photographers, until the 1970s it was popular with 35mm and medium-format users. Newer developers are probably better for modern films, but D-23 may be good enough for occasional film shooters. The difference is probably negligible. Anyone who demands maximum quality is likely shooting digital, anyway. For the fixer, is there a commercially available powder like Photographers' Formulary TG-5 Archival Fix, which is a pH-neutral rapid fixer available only in liquid form? Someone has probably already devised an all-powder workflow. Suggestions welcome.