Dyeing with Black Beans (& Mordanting with Alum) « Osborn Fiber Studio
dyeing with black beans... You just use the water you soak the beans in, so you still can cook with the beans. Results range from blues to greens.
Dying with black beans, part 2. Mordant: 1 tablespoon alum + 1 teaspoon cream of tartar in enough water to cover the shirt well.