1) How Rainbows Are Formed

What you need

  • Mirror
  • Blu-tack*
  • Washable crayons*
  • Bowl*
  • Torch* (you can use the torchlight function in mobile phones)
  • Dark room*
  • Drawing paper*
  • Water*
*Not provided


Step by Step

1. Fill the bowl with water and put it in a dark room near the wall. 

2. Stick the drawing paper on the wall using blu-tack. 

3. Open up the mirror such that it forms an 'L' shape and place it into the bowl of water. 

4. Shine the torchlight directly at the side of the mirror that is fully submerged in the water. 

5. Adjust the angle of the other side of the mirror until a rainbow is reflected on the drawing paper. 

6. Quickly draw lines to capture the rainbow and colour directly on the drawing paper with the washable crayons.


      What you need

      • Food colouring** (red, yellow and blue)
      • 7 cups**

      • Stirrer**

      • Filter paper

      **Items provided in the Colour Mixing Challenge

      Step by step

      1. Place the 7 cups in a row and fill the first, third, fifth and seventh cup with 80ml of water.

      2. Add 5 drops of red food colouring to the first and seventh cup. Stir evenly.

      3. Add 5 drops of yellow food colouring to the third cup and stir evenly.

      4. Add 5 drops of blue food colouring to the fifth cup and stir evenly.

      5. Take a filter paper and fold it into half and in half again lengthwise. Repeat until you have folded all 6 filter papers.

      6. Place one end of the folded filter paper in the first cup and the other end in the second cup (make sure the ends of the filter paper touch the bottom of the cups).

      7. Continue Step 6 until you have placed the last filter paper in the sixth and seventh cup.

      8. Observe and watch the rainbow relay happen right before your very eyes!


      What's happening?
      The filter paper is made from fibres and the water is able to move through the gaps in the fibres. The gaps in the filter paper help to pull the water upwards.