Painting glass on the reverse surface to view through the undercoated side has been used for centuries for works of art, and to embellish utilitarian objects. The process and the varied media are briefly described. Fading and darkening of certain colors may occur, but the most common conservation problems are flaking paint, and local detachment of the paint film appearing as bubbles. These objects should be protected from sudden changes in temperature and relative humidity which will cause dimensional changes in paint and glass, resulting in shearing. Backings are recommended in order to protect from abrasion. Flaking paint may be consolidated, and losses filled while preserving the integrity of the piece. Broken glass often may be repaired with optical cement or by sandwiching between two sheets of glass. Routine examina tion is advised. -- AATA