I used the fibonacci instructions to cut Bullseye glass. The piece was placed in the middle of a primed mullite shelf in my Skutt GS22ClamShell kiln with the solid 14cm x 40 cm on the bottom and the cut pieces on top. Smooth sides faced up on all pieces. The full fuse firing schedule followed was the recommended one from Tip Sheet 7 (400F to 1225F hold :30, 600F to 1490F hold :10, AFAP 900F hold 1:00, 100F to 700F hold :00, AFAP to 70F hold :00.) The attached photo shows large bubbles along one side of the fused piece.
Perhaps I should add a pre- bubble soak and make segment 1 300F to 1150F hold :30. Or...perhaps I could increase the time of Segment 1 (400F to 1225F) to hold for 1:00. Any ideas?