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Why do you need to learn the keystone technique for mosaics? Keystoned tesserae maintain parallel edged goutlines perpendicular to a curve. See examples and how to cut the right shapes here!

First off, what is keystoning? Keystoning is a cutting technique used on square tesserae being laid along a curve, that eliminates the problem "v" shaped gaps which otherwise occurs. Read rest at. Saved by Elizabeth

Learn to cut glass into shapes. Good tutorial for cutting curves!

Whether you're making a stained glass project or glass fusing project one of the essential skills is knowing how to cut glass.