Easy to make Black Walnut, Brown Ink.
In the Fall, collect black walnuts from the ground, make sure they are green with brown spots (more the better). Put them in a pot of water enough water to cover the nuts + a bit more. Simmer away for a few hours. If the hulls were not broken apart from ripening in the plastic bag - you can always poke them and tear at them with a knife/fork as they simmer to let all the good brown out of them. You can check the strength of the ink if you have a white stove top or a paintbrush and paper too. I think this simmered for three hours - I added more water as to not let it get too low but still only wanting 3/4ths of a Mason jar full.
I strained out the large pieces of walnut hull/nuts out with a large metal spoon with holes. I then chucked the spent debris over the garden fence. Using cotton bags and a blue canning funnel I poured the remaining liquid in to strain...
Then this happened - too many large pieces remained and over flowed the funnel and out thru the sides. I quickly changed the cotton cloth to mesh and it worked out much better. I also had to move the "gunk"' around with a fork so it would go thru the mesh.
Thats it, easy, messy but easy. *Guess I should have done this outside*
Store in a mason jar with a lid. It has been several months now and I see no mold. Gum Arabic can be added to improve the flow of the color but I like it the way it turned out without it. If you like the color - great - if not simmer just the liquid down a bit more to get a stronger color.
Currently I am knitting a large cowl scarf with my latest hand spun plant dyed yarn - I'll show you when I'm finished.