The traditional 'proof' measure of beverage alcoholic strength derives from the maritime method of 'proving' that rum was not waterered down, by dousing what with the rum and igniting it?
Black powder Gun powder 火藥 Nitrous powder Process of corning black powder Blasting powder Black gunpowder Blackpowder Black-powder Serpentine powder The Invention of powder Gun Powder Gunpowder
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Gunpowder