This is just something that happened to occur to me this morning, while brewing a pot of tea, of all things.
Ferric oxalate (Fe2(C2O4)3), familiar to those who have dabbled in platinum/palladium printing, is a photo-sensitive chemical that reduces to ferrous oxalate (FeC2O4) upon exposure to ultraviolet light. If ferrous oxalate were “developed” with gallic acid or a suitable, soluble gallate salt, then the ferrous gallate (which is the key component of iron-gall ink) formed could create a dark, contrasty image.
I should point out that all this is conjecture, and practical experimentation would be needed to prove the theory.
The following is essentially a list of lists. Specifically, lists of developer formulations for film.
To date, the film developer with which I’ve had the most experience is Ilford’s ID-11, or the very similar Kodak D-76: “standard issue” for a student of photography, at a time when the available range of analogue photography products is rapidly thinning. As film becomes commercially unsustainable, photographers in that medium may need to take control, and hack their own chemistry.
Further to my earlier post on coffee-based film development, Caffeine-Ascorbate Developers are a class of developers that you can literally make in your kitchen.
Additional linkage: Developer recipes; Development times; Discussion & examples
Photographic formulas from The Frugal Photographer
Here, we have a collection of formulae from the Frugal Photographer website. At least one seems to have been lifted from The Darkroom Cookbook, Third Edition (Anchell, 2008), which is as in-depth a resource as any modern photographer could want.