Due to its blendability, washability and versatility, this quick-drying craft ink has become a favorite among fabric artists. And because it's water-based and non-toxic, All-Purpose Ink is fun for artists of all ages. Use it on wood, paper, leather and other porous surfaces too. All-Purpose Ink must be heat set on fabric for permanence. Heat set between color applications to prevent bleeding, or layer colors to achieve a blended "watercolor" effect.