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Exploratorium Senior Scientist Paul Doherty explains a double rainbow sighting at Burning Man 2010!

What is indigo anyway? Staff physicist Paul Doherty tells the story behind ROYGBIV, and how he'd like to change that standard palette.

Exploratorium staff physicist Thomas Humphrey explains what temperature and color have to do with one another.

A detailed demonstration of how to do the Color Chromatography activity, which lets you see the colors hidden in black ink. Includes a discussion of materials needed.

An introduction to an activity that lets you discover the secret colors hidden in black ink. With a paper towel, a black marker, and a cup of water, create a rainbow of colors while exploring capillary action and chromatography.

Explore the science behind this activity, including capillary action (how the water moves up the paper) and chromatography, or how different elements of the ink are carried along at different rates, allowing you to see that black ink is actually made up of many different colors.

An introduction to a spinning disc called a stroboscope, which lets you create your own animated cartoon.

A detailed demonstration of how to make a stroboscope, including a discussion of materials needed.

The science behind the Whirling Watcher stroboscope, including a discussion of the phenomenon called persistence of vision, which in this activity creates the illusion of a galloping horse.

In this zany competition teachers will have ten minutes to create a science activity from a special secret ingredient. This week: crayons!