Coffee Filter Rainbows

How we did it:
Materials List
- coffee filters
- liquid watercolor paint - or food coloring
- droppers
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Fold the coffee filters in half and set up some liquid watercolors (in rainbow colors, of course) to use.
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Use a dropper to “paint” rainbows on the coffee filter. Watch how some of the colors blend together!
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Let the coffee filters dry and then open them up. Do you see the rainbow? What other color combinations can you experiment with?