Coffee and tea have been experimented with over the years as staining-type developers for film. There is a good article on the RIT web site that also makes reference to using coffee as a print developer. Try it and see. Expect some long development times though:
Of course, if you consider coffee to be toxic this might not be your thing
An alternative is to use a printing out paper (P.O.P) which is developed through the use of UV light. This is a traditional process which requires a special paper. Chicago Albumen Works are the main supplier and you can also purchase special fixers from the Photographers' Formulary on our web site (see main menu):
Film Photography & Darkroom discussion
Moderator: Keith Tapscott.
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