Variations in flame chemistry, exposure time and temperature alter which metals are deposited on the surface of the glass.The green metallic finish is achieved using a hot reduction flame. The silver tone can be achieved from brief exposure to a cool reduction flame, while the red tones are developed by repeated reduction. Contrast between these metallic finishes can be highlighted by using a small oxidizing flame to remove the metallic lustre from selected portions of the bead, then re-exposing the bead to a reduction flame, building metallic layers of alternating composition.