I agree with everything in
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September 14, 2009 at 4:43 am #10674
I agree with everything in Richard’s response.
That said, 90 COE and 96 COE glasses don’t behave all that differently. There are some subtle (and arguable) differences between fusible glass from different manufacturers – but none that would cause the result you describe to happen with one glass and not the other.
Helios Kiln Glass Studio