I wash the fabric with Synthrapol detergent, which is perfect to prep fabric for dyeing.
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Wash avocado pits completely to remove any flesh. You would need 3-4 avocado pits per 1/2 lb of fabric.
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Put your whole pits into the bottom of the pot. Add enough water to cover the fabric that will be dyed.
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Remember not to boil the pigment for too long, it's the time not the heat that produces the richest hues.