It is well-known in kiln forming circles that float glass is inclined to devitrify with long, slow or repeated firings. I decided to try to take advantage of this for a panel.
I shingled the strips of float and fired them at 835C for 10 minutes. I expected a striped result with devitrified surfaces alternating with clear cut edges.
I didn’t get it, though. Instead there were areas of mild devitrification, but no strong bands.
|top, general view|
|View of the top ends of the strips|
|General view of the bottom|
|Detail view of the bottom ends of the strips|
There was some evidence of devitrification at the ends of the strips where points were formed.
|Some pointed ends showing devitrification|
Even when viewed in detail, there is little evidence of devitrification. I continued, to do a slump, but even then, the tin bloom and devitrification did not show strongly. Sometimes when you want an effect, you are unable to provoke it.