This invention relates to an ink impregnated material, particularly an ink roll, useful in the printing of high contrast images suitable for laser scanning. The ink roll according to the invention is a microporous polymeric structure impregnated with an ink. The ink is repetitively transferable to a...http://www.google.co.uk/patents/US4768437?utm_source=gb-gplus-sharePatent US4768437 - High contrast printing material
