Sargent Art 22-6085 8-Ounce Watercolor Magic, Black Washable-washes from more fabrics and surface with simple soap and water, may stain some porous surfaces that cannot me laundered AP certified, conforms to ASTM D 4236, Safe and non-toxic Made in USA One bottle can last up 100 times as long as a watercolor cake, make it go even further, dilute with water Try it for rubber stamping