Developing B&W Film with Coffee: The Caffenol Guide.

Caffenol is a DIY film development technique that uses coffee as a developing agent and vitamin C as an accelerator. It is cheap, environmentally friendly, and easy to make. The basic recipe consists of coffee, vitamin C, and washing soda. A separate fixer is also needed, which can be made using sodium thiosulfate. Caffenol allows for creative control over the final image and can generate high-fidelity photographs on a budget.