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General Chemistry Science Fair Project

Baking Soda Invisible Ink

Baking Soda Invisible Ink | Science Fair Projects | STEM Projects
What if you could write secret messages that nobody could see? This experiment will show you how to make invisible ink using baking soda and water, and then reveal the writing with grape juice. It's like being a spy!


The hypothesis is that baking soda mixed with water will create a solution that can be used as invisible ink, and grape juice can be used to reveal the hidden writing.

Method & Materials

Mix baking soda and water to create invisible ink, then use a paintbrush to write a message on white paper. Let it dry, then paint grape juice concentrate over the paper to reveal the hidden writing.
You will need baking soda, white paper, water, paint brushes, and grape juice concentrate.


By mixing baking soda with water and using grape juice concentrate, you can create invisible ink and reveal secret messages. The experiment showed that the natural dye in grape juice changes color when it touches the baking soda crystals, making the hidden writing visible.

Why do this project?

This science project is interesting because it allows you to create invisible ink and reveal the secret message with the grape juice concentrate. It also teaches you about how natural dyes can change color due to chemical reactions.

Also Consider

Experiment variations to consider include using different liquids to reveal the hidden writing, such as lemon juice or vinegar, or experimenting with different types of paper to see if the results are different.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related video

Hey there! Here are some awesome videos about this science project that we think you'll really like. They're not only super fun, but they'll also help you learn more about the science behind the project. So sit back, relax, and get ready to have some fun!!
Don and Becky were thrilled to receive a secret message, written in invisible ink. Eager to uncover its contents, they show us how to make invisible ink and reveal the hidden message. Keep watching to discover what secret message they received!
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