The side benefit of dyeing with black walnut is the lovely brown fingernails you are left with if you don't wear gloves!
Leaves were chopped, boiled, and steeped. I may have added a little vinegar to the pot. The next morning I strained the leaves and added my fabric. After bringing the dye to a boil, I reduced the heat and let it simmer for an hour. The colour wasn't the greatest, so I added some iron mordant. Magically, the fabric turned brown. I did 4 samples of fabric. The darkest was in the longest and was first in the pot. The others were in for different lengths of time. I am liking all of them!