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The milk rainbow

Instructions

1.Pour some milk into a saucer (ignoring your cat: this is for the cause of science).

2. Drop four drops of different colours near the edge.

3. In the centre, add one drop of dishwashing detergent.

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You will need:

- Milk

- Plate

- Food colouring

- Detergent

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The drop of detergent reduces the surface tension at the point where it dissolves the fat molecules in the milk. The higher surface tension of the surrounding milk pulls the surface away from that spot, dragging the food dye with it.

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