Halloween is awesome and so is science!
This cool effect occurs because the food colouring is less dense than the milk so it sits on top and when dish washing liquid is added, it breaks down the fat in the milk and carries the food colouring along for the ride. I only have skim milk at home, but I'm sure it would look even cooler with whole milk!
Music is (c) The White Stripes song- St. James Infirmary Blues
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