From the Heart: Chemistry that Reveals Your True Colors. Just like a Valentine surprise, learn how to write a message starts out invisible because it is written with a special ink that dries clear.
The Big Reveal: When iron chloride is added, chemistry takes over and the hidden message suddenly appears right before your eyes because the iron chloride reacts with the invisible ink to create a brand-new substance.
The reaction creates bold red or blue colors, showing how chemistry can reveal what was hidden and show how simple chemical reactions can create dramatic results.
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