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How do I make a homemade lava lamp?
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To make a homemade lava lamp, you will need some clear glass or plastic bottles with narrow necks, food coloring, water, oil, and a heating source. Fill the bottles about three-quarters of the way full with water. Add a few drops of food coloring to each bottle. Heat the oil in a pan on medium heat until it is hot but not smoking. Pour the hot oil into one of the bottles. Place the other bottles upside down over the oil so that they are suspended from their narrow neck. Allow the bottles to cool for a few minutes before turning them upright. The colored oil should create a swirling effect inside the bottles.