Speedball fabric inks: for use on cotton, polyester, blends, linen, rayon, (but NOT on nylon). Wash-fast when heat set or left to cure for one week. These inks provide a safe option for use in the classroom where an iron is not practical for heat setting, as they offer a one week curing option where no heat is required. Note: inks are oil-based but wash up is easy with warm soapy water. Colour: Yellow.
Zart Art School Catalogue page: 203