Piñata Alcohol Ink Brass. Brass is a stunningly reflective metallic colors made from real metal pigments. Metallic colors are opaque and lightfast. Piñata Alcohol Ink Colors are highly saturated, fast-drying products for any hard surface, including glass, metal, plastic, ceramic, stone, leather, resin, polymer clay, YUPO® and more. The inks are waterproof and can only be cleaned up with alcohol, the clean-up solution. They re-wet themselves when extender is applied. Applying Extender solution results in unique effects and techniques not easily achieved with water-based inks. As a dye-based, highly transparent ink, Piñata Colors are unparalleled for vibrancy. Only the most lightfast dyes have been selected for the palette. Acid-free with excellent adhesive properties, Piñata Colors are the go-to inks for all non-porous surfaces.