NNP

Monogram Filler.  A crayon-like wax material which when rubbed over sunken relief – monograms, letters, figures particularly – fills the incise relief with its contrasting composition to aid legibility. It is available in a variety of colors and lusters, is especially useful for edge lettering appearing on medallic items, and tenaciously holds within the sunken relief. The application is made at room temperature (in contrast to lacquer stick fill-in where the metal must be heated).  See fill-in.

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