In this tutorial I’ll show you how to dye cotton fabric blue with black beans using DIY iron mordant and the cold dyeing process.
- black beans
- pre-washed cotton fabric, cotton yarn or cotton clothing
- DIY iron liquor mordant
Soak 1 cup of black beans in enough water (more water won’t weaken the dye solution, but the fabric will dye more evenly). Be careful: the black beans will also stain your soaking pot, such as a porcelain bowl. Don’t ask me, how I know! 😉
Let the beans soak for about 24 hours.
Mordant your yarn or fabric with DIY iron liquor.
Remove the beans from the dye solution (and use them for cooking). The dye solution is now dark blue. Soak the fabric or yarn in the dye solution as long as you like. Then rinse in water.
I used cotton yarn and let it soak about 12 hours. The yarn dyed with black beans is darker than the yarn dyed with red cabbage.
Here are more dye experiments with black beans.