1) Use an old shawl or new
2) Use a rubber stamp with a deep pattern works best
3) Using your brush apply a small amount of paint onto the raised parts. You'll get some elsewhere but do your best to keep things neat.
Make sure your worktop is nice and even and then place the stamp directly onto the fabric and push down
Lift the stamp straight up. If you don't your stamp will smudge. And definitely feel free to practice this on scrap before you take on the big show.
Your stamp won't be perfect in all places but that lends to the charm of the fabric.
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