A bushier flame is obtained by lowering your pressure at the regulators, you will need to open the torch vales a bit more but the result will be a lower velocity flame. Yes, if your punties are welding to the marble the marble is too hot. Also it it "catches" on the edges of your mold it is too hot. Your fish look very nice.
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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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