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Learners are challenged to discover the relative densities of colored liquids to create a rainbow pattern in a test tube.

The beautiful iridescent colors of a bubble in a can! With this Exploratorium Science Snack, create beautiful soap films on the open end of a can to see beautiful rainbows of color.

In this outdoor activity and observation game, learners hunt for a variety of textures, colors, odors and evidence of organisms in the activity site.

In this activity, learners explore acid and bases as they create their own invisible ink out of baking soda and grape juice.

In this activity, learners will experiment with changing flower colors. Learners will investigate the effects of acids and bases on flower colors.

Do you have a hard time matching paint swatches with your furniture? When you consider human perception, color is context dependent.

In this activity, learners will create an optical illusion top. Learners will explore color mixing, physics and design through this activity.

In this activity, learners observe mixtures of sand samples glued to note cards, and consider how sand can differ in size, shape, and color, and where it comes from.

Look at pictures through different color filters and you'll see them in a new way. People have used color filters in beautiful photography or sending secret messages.

In this challenge, learners have to figure out in what order to combine five solutions to change the color from clear, to yellow, to blue, and back to clear.

How many colors make black? Gather as many water soluble black markers as you can find.

In this activity (17th on the page), learners investigate why you cannot see colors in dim light.

In this activity, learners will explore how light can refract or break apart into different colors.

In this STEAM activity, learners create a "pixel tube" to explore reflections of light and color mixing.

In this activity, learners will explore how different colors of lights interact with objects around them. Will a blue object stay blue with a red filter?