Activity
Exploratorium

Exploratorium: Science Snacks: The Three Little Pigments

For Students 9th - 10th
For this activity, you print different colors of the same image onto acetate, then explore the different color effects you get when they are overlaid on each other in various combinations.
Activity
Museum of Science

Museum of Science and Industry: Online Science: Three Colors of Light

For Students 2nd - 6th
An experiment where students combine solutions from red, green, and blue glow sticks to make different colors and to make white light.