Materials
Baking soda
Water
Cotton swabs
Grape juice concentrate
Paper
Optional: heat source
Instructions
Mix baking soda in water to create a solution
Dip the cotton swab into the “ink”, and use it to write your message on the paper
Wait for the ink to dry
Paint over the paper with grape juice
OR heat up the paper with a flame, iron, or light bulb
The message should reappear
Science Behind It
Baking soda soaks into the paper and disrupts the fibers on the surface. Because baking soda is a base, and grape juice can act as a pH indicator, the grape juice changes color upon reacting with the baking soda, revealing the message.
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