My batch anneal schedule isn't working :(

[beadysam]

Beadysam, all the glass I'm using is plain old effetre, I don't have much else

I just asked because, I recently had a sort out of my beads and randomly checked them with filters.  The ones that were silver glass and Lauscha were stressed, but all the others were fine.  Even on odd shaped ones you could see where the Lausch clear encasing touched the silver glass (or in some cases plain old effetre) and left areas of dark stresses.  I won't be selling those beads!  Not that I ever get around to selling my beads anyway....

[noora]

I just asked because, I recently had a sort out of my beads and randomly checked them with filters.  The ones that were silver glass and Lauscha were stressed, but all the others were fine.  Even on odd shaped ones you could see where the Lausch clear encasing touched the silver glass (or in some cases plain old effetre) and left areas of dark stresses.  I won't be selling those beads!  Not that I ever get around to selling my beads anyway....

Oh wow, that can be good to know! Maybe it's time to let go of the illusion that glasses with matching COE don't cause stress if properly annealed. Especially after my incident with a fused pendant made with Fuseworks COE 90 + Bullseye COE 90 that broke in the customer's purse I actually couldn't see any stress in the tack fused test piece I made afterward to see if there was compatibility problems, but a couple of weeks later the test piece had cracked too so obviously it wasn't fine either. 

[noora]

Now that I did an actual batch anneal (100 beads or so) the new schedule didn't work either   The stress marks are still there on the transparent beads. I'll give it one more try with an even higher temperature, then I'm giving up. It's just those ~100 newbie beads that I made before I got a kiln anyway. None of them are pretty enough to sell or give away anyway.