Canary Yellow Opalescent Medium Frit - 4oz - 90COE - Made From Bullseye Glass This fusible glass frit is 90COE; 4oz package. Made from crushed, screened, and magnetically cleaned Bullseye Compatible sheet glass. Frit is versatile and can be used in: Pte de verre and kilncasting; Kilnforming, Torchworking and blowing, to create colors and patterns on surfaces; full-fusing, tack-fusing and much more. Please note that some frit may strike, or change color, once its full fused.