Foul Bite
Foul Bite. An anomaly of acid etching; cut into metal where it is not wanted; also called false bite. See acid etching. By extension, the same term is used in engraving dies handcut for a slip of the burin, cutting into the surface of a die where it was unintended.
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