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