WATERPROOF, for Paper & Film.
Ultradraw ink was created to provide technical pen users a rich, non-smearing, black India ink with a long open time for non-clogging. It is waterproof, dries quickly on all drawing surfaces and is also suited to airbrushes, crow quills and calligraphy pens. In a .75 oz.(22ml.) filler bottle.
by Koh-I-Noor, Rapidograph