This Alcohol Ink is fast-drying, permanent, acid-free and blendable. Ideal to use on their own or blend together on polypropylene and glossy papers, ceramic, glass, metal, shrink plastic, vinyl, leather and more. The Rainbow color additive transforms any color with a shimmer effect. The Extender lengthens the ink's open time, lightens, lifts colors and increases transparency. The 20ml bottles feature a narrow precision tip.