I expected the pH of the original dye bath to be really acidic because coffee is acidic, but it was surprisingly fairly neutral, at a solid pH 6. The recipe did call for a lot of water though.
You need:
Coffee grounds
Water
Pot
Cheesecloth
- Mix 4 parts cold water to 1 part coffee grounds
- Bring to a boil, lower to simmer
- Simmer for about 30 minutes
- Let cool and strain
- Adjust pH as desired
I’m wondering if using less water and more coffee grounds would result in a richer colour. Or if making it really, really acidic would bring out more intense colours. So, it’s an idea for another project (:
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