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How closely should one follow published or recommended glass firing schedules?

Never hesitate to change a firing schedule. For instance, if you want the glass to fire hotter, feel free to raise the temperature. A firing schedule is only a guideline. Since every kiln fires a little differently, results may vary from one kiln to another even when using the same firing schedule.

You can look at the glass as it fuses. Watch it go through every stage of fusing if you want. (Always wear firing safety glasses and, if necessary, protective gloves when you look into the hot kiln.)

Position the glass so you can see it through the peephole. If your kiln has no peephole, crack the door or lid open half an inch for a couple of seconds to view the glass as it fires.

At first the glass will turn orange, and then the edges will just begin to round. The layers will sag and then fuse more deeply. When the glass reaches the stage of fusing that you like, turn off the kiln. Write down that temperature for future programming so that you can duplicate the firing.

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