Smartie Detectives

Food colourings are often made of several different chemicals. As the water spreads through the paper the mixture separates and rings of colour are formed. You can try this for yourself using Smarties, like below:

 

Put the smartie on the blotting paper, wet it, and watch!

 

The various colours which make up the smartie separate out at different rates, leaving behind a psychedelic colour smear effect.

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