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When you set an acetylene bottle on its side, the liquid acetone/acetylene solution will seep into the top portion of the bottle (where it’s not supposedto be).

If you stand the bottle back up and attempt to use it without enough time for the liquid acetone/acetylene solution to settle back down, you’ll draw acetone into the regulator, and your oxy-acetylene flame will turn purple. Even under normal use, if you attempt to consume more than 1/7 the bottle’s volume per hour, the acetylene will not have enough time to disassociate from the acetone - and you’ll get the same purple flame.

But most importantly - when liquid acetylene/acetone is present within the top of the bottle, the acetylene becomes "sensitive to shock." In the picture below, it is not known whether or not the guy dropped the cylinder while unloading it from the car, or if he simply set it down on the ground a little too hard. Either way, he was blown to bits. Thus regardless of what your local and state laws might say – setting an acetylene bottle on its side is dangerous.

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