Printer's proof made on transparent acetate. By use of a special press technique, the same material is printed in perfect register on both sides, giving greater opacity to the impression. Acetate proofs are usually prepared by the creative staff of an advertising agency to be used along with other collateral material in an advertising campaign. Frequently, they are used for sales presentations in charts and other displays. For example: In a presentation about a company, one acetate proof can be laid over another as speech support to demonstrate graphically a company's growth over a period of time. The opacity allows each overlay to add a new dimension to the picture.
An acetate proof is sometimes called a bronze proof because bronze powder is dusted on the inked impression to make the printed matter completely opaque (see bronzing).
