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Water Fireworks

You will need:

Water, oil, food colouring (any colour of your choosing), 16 oz clear glass, another 16 oz clear glass, a fork


What to do:

Fill the tall glass almost to the top with room-temperature water. Pour 2 tablespoons of oil into the other glass. Add 2 drops of food colouring to the glass with the oil. Stir the oil into the food colouring using a fork. Stop once you break the food colouring into smaller drops. Pour the oil and colouring mixture into the tall glass with water.


Watch how the food colouring will slowly sink in the glass, with each droplet expanding outwards as it falls. Looks like fireworks, right? It is because food colouring dissolves in water, but not in oil. So when you pour in your food colouring/oil mixture the oil will float at the top of the water because it is less dense, and the food colouring will begin to dissolve once they sink through the oil and into the water.



  • Try using red and blue as your food colouring, and do one drop of blue and one drop of red when you start to mix the oil and food colouring together.
  • You can also try doing it without the oil and observe and record how the results are different.
  • What if you use a larger glass? Does it change the results?




Making Predictions


The concept and practice of predicting teaches children about cause and effect. Being able to predict aids children's learning across the curriculum. It enables them to make comparisons and build on their understanding of pattern and cause and effect.

Test your child’s predicting skills by playing this game: What Will Happen Next?.