If you add food colouring to milk, not a whole lot happens, but it only takes one simple ingredient to turn the milk into a swirling colour wheel. By adding a few drops of food colouring to a plate of milk, then wetting a cotton bud in dishwashing liquid and then placing this on top of the food colouring in the centre of the plate. See what happens... Why does this occur? What is the 'science' behind this simple experiment? Why don't you try this experiment at home? All you need is: whole milk, food colouring (3-4 different colours, if possible) and dishwashing liquid.
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