Oh too bad you tossed the walnuts! English and black walnuts are the SAME!! I was going from a book about natural dyeing, Wild Color by Jenny Dean. No need to shuck, just let them ferment in a bucket outside. But now I know why their were pieces of husk in the yard. Darned squirrels. At the end of fermentation, I strain the pieces out, and compost the whole mess of solids. I know I'm wasting potential dye, but they drop nuts every year! Ps toss in some paper and it will dye that too! This year I added 1/2 cup iron liquor (old nails and vinegar) to 3.5 gallon of walnut dye. Gave some wool a gorgeous deep brown. Hooray. Will concentrate the dye down by boiling before trying on leather. Wish me luck!