One bottle of Sargent Art Watercolor Magic can last up to 100 times as long as a watercolor cake. To make it go even further, dilute with water. These watercolors washes away from fabrics and surface with simple soap and water, but may stain some porous surfaces and cannot be laundered. Details:10 assorted colors8 oz bottlesPaintAP certified, conforms to ASTM D 4236Safe and non-toxic