Check out this video on creating invisible ink!
Have you ever wanted to send a secret message? Then you might know of invisible ink—a special type of ink that you can use for writing and that does not show up on paper. Find out in this activity and write your own secret messages!
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“Depending on the type of chemical reaction the invisible ink is based on, making the ink visible can take different forms such as adding heat, applying a certain chemical or using ultraviolet light. All these special treatments result in the secret message being revealed.”
- Try different acids to write your secret message. Try lemon juice, orange juice or vinegar.
- Can you find other ways to make your baking soda message visible? Try other acids such as blueberry juice, hibiscus tea, or simply vinegar with a few drops of food coloring. Do you get the same results?
Source: https://www.sciencebuddies.org/
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