Speedball - Opaque Fabric Screen Printing Ink - Blue Topaz - Speedball's opaque line of Fabric Screen Printing ink is available in 10 iridescent colors. Ideal for dark fabrics, paper or cardboard (not for use on nylon). Washfast when properly heat-set. Non-flammable, no solvents and no offensive smell. Can be screen printed or painted on with a brush, cleans up easily with water. AP non-toxic, archival qualities.