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With a coffee filter, a black marker, and a cup of water, discover the secret colors hidden in black ink.

Making liquids of different densities to perfectly lay on top of each other can be a frustrating exercise. The Exploratorium created this activity as a fool proof way of making a density column.

This is an online exhibit about color perception. Learners set a random background color and then try to mix red, blue, and green light to match.