I have read that it is best to put glass on a kiln shelf to make sure that the temperature around the glass is as uniform as possible. But, I have a small kiln with a bit over 4 inches of height, making using a kiln shelf only possible for fusing flat. Also, I have been wondering if I can “double up” and flat fuse a couple items at the same time, one on the floor of the kiln and one on an elevated kiln shelf.
To test the effects of location in the kiln, I decided to make some sun catchers for my sewing room. After cutting the glass pieces, I compiled one sun catcher on the floor of the kiln. Then the kiln shelf was elevated above it on 1″ posts. Two more sun catchers were put together on the shelf. The glass was fused following a contour fuse schedule. I selected contour fuse because I wanted the glass pattern be more distinct and crisp than full fuse would create. Also, I thought this temperature would better show if any differences would result from the location in the kiln.
What a learned was that placing glass directly on the kiln floor caused the glass to reach a higher temperature.
These are now hanging in my sewing room window. I think I may actually make some more soon for the other window in the room.