Verre églomisé

Verre églomisé, from the French term meaning glass gilded, is a process where the backside of the glass is gilded with gold or metal leaf using a gelatin adhesive. The result is a mirror-like, reflective finish in which designs are then engraved. The technique dates back to the pre-Roman eras, but it's name is derived from 18th century French decorator Jean-Baptise Glomy who is responisble for it's repopularization.