Speedball Opaque Fabric Screenprinting Inks are ideal for use on dark fabrics, paper or cardboard (not for use on nylon). Washfast when properly heat-set. Non-flammable, no solvents and no offensive smell. AP Non-toxic; conforms to ASTM D-4236. Can be screenprinted or painted on with brush and cleans up easily with water. Archival qualities. 10 iridescent opaque colors.