Part V: Planchet Errors:

Rolling Mill Errors:

Rolled-in scrap, bristles from descaling brush

Definition: A bristle from a wire brush used to scrape clean the dies. Because a complete wire bristle looks rather like a staple, they are often misidentified as such.

Below a 2000-P Maryland quarter with a rolled-in steel wire (bristle from a rotating descaling brush)  The wire probably corresponds to a piece of what used to be called a “staple”, but which is now recognized as a bristle from a wire brush used to clean the dies of obstructing matter. Note that the wire has split the clad layer, something that doesn’t happen with a struck-in wire (at least among coins struck within the collar).