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[–] automagnus 0 points 0 points (+0|-0) ago 

I have not tried this, but people should be cautious with glass and heat. The heat is localized at the top of the bottle which can cause it shatter. With a few exceptions (pyrex/borofloat) glass should not be unevenly heated as it will expand in heated region and not in the cool region causing a lot of stress that can lead to shattering.

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[–] MrPim 0 points 1 points (+1|-0) ago 

Yeah, I'm not sure I want a glass bottle filled w flammable oil and a lit wick on top. Molotov cocktails for your next BBQ!