Makeshift Technology: Sulfurless Black Powder
Put the alcohol in the freezer the night before you want to make the gunpowder. Once the charcoal is finely powdered (mine was finer than powdered sugar), you are ready to make the black powder. According to Wikipedia on sulfurless black powder, "They typically contain 70.5 parts of saltpetre and 29.5 parts of charcoal."
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