Proof Polish. A diamond dust or emery abrasive compound and the action which is accomplished with a power wheel to polish the area of a die where a proof finish is required. The abrasive is often used in a slurry or paste form; the polishing is often followed by a polishing with rouge on the same surface of the die. This two-step polishing produces a die which imparts a mirror-like struck surface with a very high reflectiveness.
excerpted with permission from
For Artists, Makers, Collectors and Curators
COMPILED AND WRITTEN BY D. WAYNE JOHNSON
Roger W. Burdette, Editor