NNP

Matte Dip.  A liquid that produces a matte finish by chemical action on any metallic surface immersed in it. Commercial matte dip solutions are available; professional chasers and metal finishers use these or formulate their own, most often made of hydrochloric acid. The liquid lightly etches the surface of metal to which it is applied;

 it’s purpose is to create a dull, unburnished surface of dead reflectiveness. It is occasionally used on proof surface dies for a contrast of proof and matte on the same piece for contrast.

   

excerpted with permission from

An Encyclopedia of Coin and Medal Technology

For Artists, Makers, Collectors and Curators

COMPILED AND WRITTEN BY D. WAYNE JOHNSON

Roger W. Burdette, Editor