Printing ink for making erasable prints.

摘要

The printing inks are intended and suitable for making opaque prints which can be removed by rubbing or scratching on areas to be covered of a print substrate by letterpress or offset printing. They comprise a release ink and a covering ink containing metal pigments to be printed thereon. The binder phase of the two systems, which is essentially free from solvents, comprises principally highly reactive, oxidatively drying products and monomers or prepolymers which dry chemically either under the action of atmospheric oxygen, possibly with additional assistance of heat (IR irradiation) or under the action of ultraviolet light (UV irradiation).