Fusion: The Next Step Love Fusing? More of the sparkle and mystery of dichroic glass in this two session class. Cold working techniques, too! Finished pieces may be picked up the following day. Marilynne Lipshutz instructor. Glass beads, marbles and sculptures are annealed in a kiln for long life. Finished pieces may be picked up the following day.If you are sensitive to dust and fumes, or if you have asthma or may be pregnant, check with your doctor and contact the studio for more information.