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Science - Grow a rainbow

This year, we have had some sad times together and some happy times. We have laughed together, looked after each other, and trusted each other.  Seeing rainbows around school and at times, high in the sky when we have been in the playground has made us feel happy and given us hope.

Today, I thought you might like to make your own rainbow, to remind yourself about how well you have all done and the huge journey you have made this year, with your learning! You have all been fabulous and made a huge journey, as far as a rainbow can reach!

Science experiment - grow a rainbow

Did you know that you can make your own rainbow?

For this experiment, you will need:

  • kitchen roll/paper towel
  • felt-tip pens
  • two small bowls of water
  • paperclip
  • thread or string

The material used to make kitchen roll has lots of small holes in it. Water is soaked up (absorbed) through the kitchen roll and begins to move upwards, like a chain. Water is made up from 'molecules', which you will learn more about in another class. The first 'molecule' in water sticks to the paper and then pulls up the next water molecule with it. Try out this experiment and see if you can make the water grow up and make a rainbow.

What to do:

  1. Cut the kitchen roll into the shape of a rainbow. Ask an adult to help you.
  2. At each end, use the felt-tip pens to colour a rainbow about 2cm up from the bottom. Remember the order of the colours: red, orange, yellow, green, blue, indigo(dark blue/purple), violet (light purple).
  3. Attach the paperclip to the top of the rainbow and tie a piece of thread to it. This will allow you to hold your rainbow (look at the picture below to help you).
  4. Add water to the two bowls.
  5. Hold the rainbow with both ends slightly submerged into each bowl of water and watch your rainbow grow.
  6. Ask an adult to take a photograph to load onto your class dojo portfolio. Have fun!