You will need:

  • A flat tray (like a biscuit baking tray or Corningware baking dish)
  • Food colouring (at least three different colours)
  • Full cream milk (low fat milk will not work for this experiment)
  • Liquid dishwashing liquid

What to do:

  • Carefully pour the milk into the tray so that it just covers the bottom
  • Add about 6 – 8 drops of different coloured food colouring onto the milk in different spots on the tray
  • Add about 5 drops of the liquid soap onto the drops of food colouring and watch the show!
  • To clean up, simply pour the coloured milk down the drain (don’t drink it!)
  • This is a fantastic science experiment. The science is this – the dishwashing liquid is chasing down the fat in the full cream milk. That’s how soap works – it breaks down fat!