From the page: Used coffee grounds: far beyond the cup
Idea 2
Drawing and watercolor ink
Homemade coffee-based inks existed long before industrial paints: illustrators and notebook doodlers always used what was at hand. The science is simple: coffee pigments stay suspended in water, and gum arabic (or white glue) acts as a binder, sticking the pigment to the paper as the water evaporates.
What you need
- Already-dried coffee grounds
- Hot water
- White glue or gum arabic (the binder that fixes the pigment to the paper)
- Small container for mixing
- Spoon or stick
- Brushes and paper for testing (thicker paper works better)
How to make it
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1
Put a spoonful of dried grounds in the container and cover with a little hot water: less water means a more concentrated, darker ink.
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2
Stir well and let the pigment dissolve for a few minutes — the water extracts the color just like a coffee maker extracts coffee.
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3
Strain with a thin cloth or filter to remove the granules: without this step, the ink spatters dots when you paint.
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4
Add a few drops of white glue and mix: it's what makes the pigment adhere to the paper instead of just smudging and rubbing off.
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5
Test on paper and adjust: more grounds darken, more water lightens — you create your own scale of browns.
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6
Store in the fridge in a closed container and use within a few days, since preservative-free inks can mold.
Finishing touches
let a few drops dry in a small lid to create a watercolor "pan" — just wet your brush to reactivate it. Perfect for shading, earthy landscapes, and even aging craft paper.
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