🖌️ Ink Your Ideas with Confidence! A 23 ml bottle that fits seamlessly into your creative toolkit. Crafted by rOtring, a trusted name in technical drawing for over a century. Experience a fast-drying, waterproof formula that keeps your work pristine. High density of pigment particles ensures vibrant, opaque lines that stand out. Designed for use with lineboard, tracing paper, and vellum—perfect for all your drawing needs. High pigment density Fast-drying formula Perfect for technical drawing The rOtring Bottled Ink for Isograph Technical Drawing Pen is a 23 ml bottle of high-quality red ink, designed for professional artists and designers. With a fast-drying, waterproof formula and high pigment density, it ensures vibrant and precise lines on various drawing surfaces.