The problem with Oxy/Propane is the oxy in the line will run out way before the propane, and after about 20 seconds your flame will turn yellow. You can keep opening the oct valve on the torch but it just runs out even faster. You don't have that problem with a HH as it uses atmospheric oxygen, make sense?
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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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