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Caffenol

Caffenol is a photographic alternative process whereby caffeine, sodium carbonate and optionally Vitamin C are used in aqueous solution as a film and print photographic developer. Other basic (as opposed to acidic) chemicals can be used in place of sodium carbonate, however sodium carbonate is the most common. There are many formulas for caffenol. All are based on preparations which contain caffeine (i.e. coffee and tea) [...]