In colour reproduction, a proof of a colour subject made on a printing press, in advance of the production run.
Printed sections of substrate material made on a press to allow for approval or final corrections before the production printing run is made.
In color reproduction, a proof of a color subject on a printing press, using the same color inks and paper stocks on which the final run will be done on. This proof is done prior to the final reproduction and is the only true and predictable way to show proof of what is contained in the litho films. There is no other proof system that takes into account printing aspects such as absorbency of stock, hue of inks, trap and other printing mechanics which occur on a press.
Trial proofs used to assure color correctness and balance.