Cracking issues
Imade my first 2" marble today, and it came out nice except that the Indego Adventurine that I used for the back cracked all around the equator of the marble with what look to be incompatability cracks. The cracks are only as deep as the Indego Adventurine, nothing extends into the clear.
I annealed it at 1030 for 1.5 hours than ramped down to 910 at 300 degrees per hour.
Did I over cook the Indego Adventurine and change it's COE? Should I have soaked it longer? Ramped down slower? This is my first big piece, I'm kind of disapointed that it cracked like it did.
ETA:
I misspoke The 300 dF/Hour is incorrect, it should be 55 dF/Hour.
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Roy
Hot glass does not crack.
Unless it is glowing and drippy, hot glass looks like cold glass.
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