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In the first fusing classes I took, the store did a tack fuse and a full fuse in one kiln load using multiple kiln shelves. What temperature is required for this technique?

You can do this in a glass kiln that has a fairly deep firing chamber and top elements, such as the GL-24AD. Fire two shelves stacked vertically and separated by posts. The glass on the top shelf will reach full-fuse; the glass on the bottom shelf will reach tack-fuse. You will need to experiment with post height, firing speed, and temperature, all factors that will affect the results of the firing. The ideal way to experiment is to see the glass before it begins to fuse. (You will need firing safety glasses.) You might also achieve full-fuse / tack-fuse in a ceramic kiln with side elements. That, too, will require experimentation. The glass on the outer edges of the shelves tends to fuse more than pieces in the center of the shelves, especially with large studio kilns.

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