Brown Opal, Medium Frit, Fusible, 1lb Jar Frit Made from crushed, screened, and magnetically cleaned Bullseye Compatible sheet glass. Frits are versatile and can be used in: â€¢ PÃ¢te de verre and kilncasting â€¢ Kilnforming, including â€œglass sketchâ€ and â€œpainting with lightâ€ techniques â€¢ Torchworking and blowing, to create colors and patterns on surfaces. Reading the Color Swatches The color of the frit in its unfired and fired states may differ greatly. In application, color saturation may vary. Thin layers may be lighter in color. Thicker layers may be darker and more saturated in color. Bullseye frits and powders are made from crushed, screened and cleaned Bullseye compatible sheet glass. Packaged in wide-mouth 1 lb. jars.