Here's an update on the black walnut projects.
The walnut ink boiled/evaporated down quite a bit. From a couple of cups of water, I got about a third-cup of ink.
The fabrics are a mixed bag.
I was a little disappointed that the samples were all kind of pale, and decided to put some of them back in a tub with some more nuts. Also decided to leave the one outside cooking in the sun for a while, as the weather is warm again. I'll keep you posted.