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In this activity, learners write invisible messages on goldenrod paper, and make the message appear and disappear using acids and bases.

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

In this physical sciences activity, learners explore how forensic investigators collect prints from a crime scene. Learners make hand impressions in damp sand and analyze the patterns they observe.

In this activity (page 1 of the PDF under SciGirls Activity: Forensics), learners will use a home video camera with a “night vision” mode to test how various inks appear outside the spectrum of visibl

In this optics activity, learners build a spy tool to secretly view things over walls or around corners.

In this activity, learners combine two substances (plaster of Paris and water) to make a cast of an object's imprint in clay.