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    American Chemical Society
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    In this activity, learners cut out a fish and then "paint" it using universal indicator and acids and bases. The initial coat of indicator changes the color of the paper (it will turn a...

    $1 - $5 per student Ages 4 - 14 10 to 30 minutes
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    The Exploratorium
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    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. Although this is a perception activity, it also...

    free Ages 6 - 18 5 to 10 minutes
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    Mount Holyoke College
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    In this activity, learners discover how a cabbage juice indicator helps identify acids and bases, and how iodine indicates the presence of starch. Learners test cream of tartar, baking soda, lemon...

    $10 - $20 per student Ages 4 - 8 10 to 30 minutes
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    Sciencenter
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    In this chemistry challenge, learners combine acids and bases in a universal indicator to create five different colors. Using vinegar, washing soda, and Bogen universal indicator, the goal is to...

    Over $20 per group Ages 4 - 14 10 to 30 minutes
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    The Exploratorium
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    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.

    1 cent - $1 per student Ages 6 - 18 5 to 10 minutes
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    Twin Cities Public Television
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    In this activity (on page 2 of the PDF), learners will see the illusion of colors produced by a rotating black and white image known as Benham’s Disk. They will experiment with rotation direction...

    $1 - $5 per group Ages 8 - 14 45 to 60 minutes
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    WGBH
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    In this activity, learners play a trick on their own brain to see if the brain can learn to ignore distracting input. Colors and words are used to play the visual trick, known as a Stroop Test....

    1 cent - $1 per group Ages 6 - 11 10 to 30 minutes
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    The Exploratorium
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    With a coffee filter, a black marker, and a cup of water, discover the secret colors hidden in black ink. This activity explores capillary action--how water moves up paper--and chromatography--how...

    1 cent - $1 per student Ages 8 - 18 5 to 10 minutes
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    New York Hall of Science
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    In this activity, learners investigate diffusion by creating underwater "fireworks" using food coloring, oil and water. Learners create the appearance of fireworks by adding drops of red,...

    $1 - $5 per student Ages 6 - 11 5 to 10 minutes
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    Association of Zoos and Aquariums
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    This is an activity about discovering the colors and beauty of nature. Learners will spend time outdoors, matching paint chip samples, colored paper, or colors of clothing to those found in nature....

    $1 - $5 per group Ages 4 - 14 30 to 45 minutes