There is a lot of silver in that glass, so not only do you need to get it screaming hot you need plenty of oxygen too. Your flame should be hissing quite loudly. I agree with Larry, if you are on an oxy con you may not be able to get it hot enought or get your flame oxidizing enough.
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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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