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Koh-I-Noor Rapidograph Ultradraw Waterproof Ink

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Ultradraw Waterproof Ink
Ultradraw Waterproof Ink
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Specially formulated to be non-clogging in technical pens, Koh-I-Noor Ultradraw Waterproof Ink is waterproof, permanent, fadeless, and acid-free. It has a longer open-pen time than most inks, yet dries quickly on the drawing surface.
Ultradraw is a dense black india ink, yet it erases easily. Use Ultradraw for airbrush, dip pens, and calligraphy pens, as well as technical pens. It comes in a ¾ oz (22 ml) plastic bottle with a filler spout, and is recommended for use on paper.

Koh-I-Noor is a registered trademark.