Art Deco Bronze Desk Lamp with Glass " Art de france", 1920-1930s. "Art de France" shades are made using the Pâte de Verre (glass paste) technique. The Technique: Pâte de Verre (Glass Paste) The main reason these lampshades are valuable is their method of making. They are not just painted glass, but are made by: Mixing colors in the mass itself: Crushed colored glass is mixed with metals and fired in a mold. Result: The glass is dense, heavy and has the characteristic “marbled” or “cloudy” texture that diffuses light very softly.