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    COSI
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    In this activity, learners explore acid and bases as they create their own invisible ink out of baking soda and grape juice. This activity includes step-by-step instructions, a video to guide...

    $1 - $5 per student Ages 4 - 18 10 to 30 minutes
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    WGBH
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    In this activity, learners create and reveal secret messages written with invisible ink! The invisible ink is actually a baking soda solution, and the magical revealing liquid is fruit juice. The...

    $1 - $5 per group Ages 6 - 11 45 to 60 minutes

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