The hypothesis is that the colored water will travel along the paper towels, reaching the empty cups where color mixing occurs, ultimately resulting in a mesmerizing walking rainbow effect.

You will set up seven cups in a row, fill the first with red colored water, the third with yellow colored water, the fifth with blue colored water and the seventh with red colored water. The second, fourth and sixth cups don’t have any water. Place a piece of paper towel between each pair of cups with one end of the paper towel on the bottom of each cup, and watch as a rainbow forms in the cups.

You will need clear cups, paper towels, red, yellow, and blue food coloring, and water.

The colored water climbs up the paper towels due to capillary action. When the colored water reaches the empty cups, the two different colors mix, forming a new color! All together, a rainbow is formed from the colored water moving to the empty cups and mixing to form new colors.

This science project is fascinating because it demonstrates how water can move against gravity through capillary action and also see colors mixing in a visually stunning way.

For variations, you can try using different temperatures of water to see how it affects the speed of absorption, or you can experiment with uneven amounts of water to observe how it impacts the formation of the rainbow.

Hey there! Here are some awesome videos about this science project that we think you'll really like. They're not only super fun, but they'll also help you learn more about the science behind the project. So sit back, relax, and get ready to have some fun!!