Step 1Prep the paper towel: Cut a paper towel strip a few inches wide. Fold it in half lengthwise if needed.
Step 2Draw your rainbow: Use markers to draw thick lines of color on each end of the paper towel (leave the middle blank).
Step 3Fill cups: Fill two cups with water.
Step 4Set it up: Place each end of the paper towel into a cup so the middle arches between them.
Step 5Watch the magic: As the water travels up the paper towel, the colors will begin to move and meet in the middle—creating a growing rainbow.
Step 6What’s Happening?
Water moves through the paper towel using capillary action, carrying the marker colors with it. When the colors meet, they blend to form new shades.
Supplies
Paper towel
Scissors
Markers (washable works best)
Two cups
Water
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