CARBONLESS COPY MATERIAL

摘要

In the production of a copy material of the type having on one face (10a) thereof a coating (B) incorporating a colour-forming substance of a kind which when released onto a receptor material (F) produces a visible mark, prior to the deposition of said coating (B) a visible image (I) is applied to said face (10a) so as to be visible through the subsequently deposited coating (B) thereby, inter alia, readily distinguishing the face (10a) carrying the coating (B) from the opposite face (10b) on which a further image (II) may be required to be formed, for example when the copy material is used to make up multi-part copy sets.