Six brilliant colors for use on t-shirts, cotton, polyester, blends, linens, rayon and other synthetic fibers (Not for use on Nylon). Washfast when properly heat-set with iron. After ink dries, use a paper or cloth interface and using household iron at medium to high setting for 3-5 minutes on each side. Non-toxic, water-based, cleans up with water, non-flammable, no solvents and no offensive smell.