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    Oregon Museum of Science and Industry
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    In this hands-on activity (on page 2 of the PDF), learners experiment with lemon juice and paper to create a message that can only be revealed using chemistry. Using an oven as a heat source ...

    1 cent - $1 per student Ages 6 - 14 10 to 30 minutes
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    Oregon Museum of Science and Industry
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    Learners observe different paper samples under ordinary room light and under a black light to learn some of the chemical differences between different types of paper. They also learn that some...

    Over $20 per group Ages 6 - adult 10 to 30 minutes

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