I just cleaned up a bunch of yucky plants from the garden. Stupid frost killed the green beans, the melon vines, and the green peppers, and damaged the tomatoes. Before the woad leaves get destroyed, I am going to pick them all and boil them up. Jenny Dean says, in Wild Color, to process them to a step just before adding the chemical to remove the air, and bottle the liquid up to the top so no air gets to the solution.
I can do this.
Taking a question to FaceBook before I start boiling water, though. http://fiberarts.ca/woad%20extraction.html suggests boiling the leaves to break down the plants enough to extract more woad. This site also does not mention adding the thiourea dioxide. Her new site: http://fiberarts.ca/blog/, is really nice but I’m not finding this article mirrored there.