Hello there fun scientists!  In this blog post we will be conducting a very similar experiment to the running water experiment.  The water rainbow experiment is very similar but with a fun twist that we will discover soon.

You will need:  

  • Access to water
  • Two cups
  • Tissue paper
  • Colouring pens (the more colours the better).


  1. Fold the tissue paper in half to make a nice thin rectangle.  
  2. Choose one end of the tissue paper and colour in 1/4 of the tissue paper.  Use many of your colouring pens to draw a rainbow.
  3. Repeat the previous step but this time on the opposite end of the tissue paper.
  4. So now both ends of the tissue paper should have the rainbow colours while the middle is blank with no colours (see example image on the right).
  5. Next add water to both cups, fill them until they are half full.
  6. Gently place one coloured in end of the tissue paper into one cup of water and place the other end into the other cup.
  7. Now leave this experiment for a few minutes and return later to see the amazing results (see image below for the amazing final results).

The Science Bit:

In this water rainbow experiment we are mixing water with tissue paper.  The materials within tissue paper are quite absorbent particularly with water molecules.  By gently placing a little bit of the tissue paper in water we soon witness the water molecules travelling against gravity upwards.  Although we added different colours to the tissue paper so the ink that is also mixed in with the tissue paper can travel with the water.  All making a dazzling water rainbow experiment. Thank you for reading fun scientists.  We hope you enjoyed the science experiment and we will see you in the next blog post.

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