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Photo-utopia has an interesting article about developing your black-and-white film with coffee. Apparently there are some chemical properties of coffee that allow you, with the proper procedure, to develop your black-and-white film in a solution with water.

The process involves using instant coffee, washing soda crystals, a developing tank, water for the developing process, and a standard photographic fixer to finish it off. The procedure really isn’t that much different from the normal negative development process, with the addition of the crystals (and, of course, the coffee). Apparently the negatives turn out “Slightly milky looking and brownish (due to staining action of developer) and also quite low contrast but certainly printable.
Need proof? The above image was prepared with coffee.
—Matthew Panzarino
Contributing Blogger