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Learners mix a solution of luminol with hydrogen peroxide to produce a reaction that gives off blue light.

In this activity (page 2 of PDF), learners play with a lens and a piece of paper to focus an image on the paper. Learners look at different things, and see how the lenses affect the image.

This is written as a display, but can easily be adapted to a hands-on activity. Learners observe and shake containers of shiny liquids.