I placed this large piece of

[jocko]

I placed this large piece of glass in the kiln, 150 to 950 held 3 hrs, as fast as poss to 1375 I opened the top un til the temp hit 950 and held for 3 hrs. I kept the thickness but the edges were divitrafied about an inch in. There was a power flash after it hit 950 and I caught it when it was at 750 so I went asap back to 950 held 3 hrs went 300 to 800 held 30min 150 to 100 held 0. I have a large EvenHeat 240vt Any Ideas??

Thanks

Mike