Sometimes a

I definitely learned a few things on this one… learn along with me!

I’m convinced this glass became unstable because of over firing. Here’s where BE talks about its compatibility and stability testing: http://www.bullseyeglass.com/is-bulls...

When you consider my piece and the glass history, the purple vitrigraph was initially fired hot enough to become vitrigraph… I don’t do vit, but I’m thinking that’s probably about 1600+?

Then I fired the first time to about 1475.
But then my second firing to add more vit was 1520 with a two hour hold because of another project in the kiln at the same time.
Then my third firing to flip it and spread it out was also 1520 for two hours!
So you can see that the vitrigraph got a TON of heat work. I’m thinking that’s what caused my issues.
So for the future, I will be more mindful about how to limit my firings and heat work… not always the best to just add more glass and toss it back into the kiln.

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Stainless steel mold and fiber liner from Bonny Doon Glass: https://bonnydoonfusedglasstools.com

My initial firing:
300-1100-60
50-1225-120 (really trying to eliminate bubbles)
350-1475-15
9999-900-180
100-600-0

For what it’s worth, here’s my schedule for the last two firings:
100-800-0
350-1520-120
9999-900-180
100-600-0

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