How to Make a Rainbow Walking Water Science Experiment

This project provides an easy and fun science experiment for kids. The water transfers from one glass to another due to capillary action, and kids will also learn how basic colors mix to form new colors.


  1. 1
    Start off with seven clear cups (can be glass or plastic). It is better if the cups are shorter and not tall and slim.
  2. 2
    Starting with the cup on the end, fill every other cup up halfway with water.
  3. 3
    Add 2 to 3 drops of food coloring in each cup that contains water. The two cups on the end should both have red food coloring. Blue in one and yellow in the other.
  4. 4
    Fold a few paper towels lengthwise about 4 times. The paper towels should end up being full length and about one to two inches wide. Then fold them in half so that it creates a tent shape.
  5. 5
    Place the paper towels in the cups so that one end of the paper towel is in the first cup and the other end of the paper towel is in the cup next to it. Continue this until each of the cups are connected with a paper towel.
  6. 6
    Let this sit for a couple of hours and you should have amazing results!


  • Some paper towels work better than others. More absorbent paper towels work the best. If after a couple of hours you haven't gotten the results you would like, try removing the paper towels and trying a different brand.

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Categories: Science for Kids