Here is an easy and fun STEM activity. It involves colour mixing and some basic reactions. This tray kept both of my girls occupied for around 2 hours. It was one in top favourites.

I used:

  • Food colouring
  • A variety of chemistry falcons/viles
  • Some syringes
  • Scoops and droppers
  • Some plastic tubes
  • Sugar
  • Sodium bicarbonate
  • Vinegar
  • Some plastic chips/buttons
  • Water
  • Messy play tray


  • We’ve practiced colour mixing, vinegar and soda reactions, learnt about measuring liquids and volumes and numbers, observed how heavy objects sank in the water while foam was floating on top. Many lessons to be learnt here while having so much fun.

Rose is only 15 months and she absolutely loved it too.

I am aware that many of you don’t have all the things I had, but kitchen bowls and spoons and some kids paracetamol syringes will do too.

Have fun!