When is yellow yellower than yellow? What color is a whisper? What's missing from the palette of Renaissance painters?

Explore the surprising side of color with Color Uncovered, an interactive book for the iPad, featuring fascinating illusions, articles, and videos developed by the Exploratorium.

There's a broad spectrum of colorful surprises in store that focus on the art, physics, and psychology of color. In keeping with our hands-on spirit, there are also a few color activities you can conduct yourself using your iPad and simple items you have at home: a CD case, a drop of water, and a piece of paper. You'll never look at color the same way again.

Best of all, it's free!

Download it at the iTunes App Store.