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In this activity, learners write a secret message in "invisible ink" and then use chemistry to view the writing.

In this experiment, learners will conduct chemical and physical tests to identify mystery substances.

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.

In this activity, learners will design a way to identify a powder found at a crime scene by comparing it with known powders, with the goal of solving a crime.

In this chemistry activity (page 6 of the PDF), learners observe a chemical change. Learners write and reveal a secret message using edible ink.