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More like this: lava lamps, water bottles and vegetable oil.
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Homemade lava lamps. Vegitable oil, a about 3/4th of the water bottle, then water. 10 drops of food coloring. Then take a alkaseltzer tab and break it into 4 pieces. Drop one in at a time and wait for each to dissove! So cool! I cant wait to try it! crafts-with-the-kids

DIY kids craft: Lava Lamp...I love these

DIY Lava Lamps for kids