Koh-I-Noor Dye-Based Universal Drawing Ink, 0.75 Ounce Bottle, Violet (3080F.VI0) Professional, transparent dye-based ink; 0.75 ounce bottle Extremely versatile, fast drying ink Waterproof and made in USA For use on paper, vellum, drafting film and tracing paper Ink is erasable on drafting film