I have used these on silk and cotton with great results, especially silk. They are really thin-like water- and don’t have to be steamed. Great for experimenting with resists, salts and shibori painting. You do have to iron to set them -like a fabric paint. But really these are much more like a dye. Has anyone used these on wool? What happened? The label says all fabrics, but doesn’t mention wool specifically. It’s made/available through Jacquard/Rupert, Gibbon and Spyder, and probably available at Dharma Trading.