Iris Gold Small Reduction Frit, 57 grams pkg. Reduction frit forms a metallic luster similar to a raku-like effect. To use, place frit on a marvering pad, heat bead enough to pick up the frit and melt it fully into the bead, melt the frit very thinly to the surface for best compatibility. Keep the glass molten and adjust the torch to a strong reduction flame. When you reheat the bead, the reduction flame causes the metalic oxides to come to the surface. Powder covers the bead with a cous luster and larger frit makes a broken or patchy pattern.