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Visitors observe a tray holding a crystal-covered brick. The crystals were created by evaporation of a solution containing liquid bluing, ammonia, and salt.

This lesson focuses on surface area and how the shape of sugar crystals may differ as they are grown from sugars of different coarseness.

In this activity, learners compare different types of salt crystals under a magnifying glass.

In this chemistry activity (page 1 of the PDF), learners will observe a physical change.