Speedball offers a range of Opaque Fabric Screen Printing Inks in metallic and pearlescent colors designed to work on even darker fabrics. The ink is water-based and suitable for most types of fabric, including cotton, linen, rayon, polyester, and most other synthetics. It is also non-toxic. Like other Speedball water-based inks, cleanup is easy with soap and water and heat setting is easy with an iron.