When needed for entry into ChipGuide or when I illustrate here; I'll be applying a non-indelible ink into worn engravings on MOP chips in order to better study the monogram/graphic. Just don't want anyone to wonder why an old, worn face has such a dark, perfect-looking engraving. Robert Eisenstadt used to use bar soap on dark-colored chips chips in order to bring out the engraving when needed for illustrating.