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Acetylene is a highly volatile unstable gas which requires a special cylinder filled with acetone that is absorbed into a calcium silicate porous mass inside the cylinder. The maximum safe pressure for acetylene is 15 pounds per square inch (psi). If acetylene reaches 30 psi in a free state, it can explode without a spark or flame. Pressures above 15 psi can cause a violent, explosive decomposition reaction.For an encore, he took a shot at an acetylene tank (no candle). I believe it exploded, or at least immediately caught on fire, I don't remember all the particulars, but it was very spectacular.