Universal Drawing inks are suitable for a variety of applications including use in technical pens and refillable plotting points. White and black are opaque, other colours are transparent. For use on paper and film. Waterproof. #3080-F. Rapidraw is a fast drying waterproof ink for film. Erasable on film, short open pen time. Good ink for experienced technical pen users. #3084-F. Ultradraw ink is for use on paper and features slow drying ink for long open pen time. Good for beginning technical pen users. #3085. All inks 90ml with easy fill spouts.