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Do you want to write down your password so that no one can see it, or do you want to send someone a secret message? If you know how to write messages with invisible ink, soon you will feel like a secret agent.
Steps
Invisible Squid with Lemon Juice
Invisible Squid with Baking Soda
Milk Stealth Squid
Invisible message written in white crayon
Invisible message without ink
This method is based on pressure and indentation on the paper.
Advice
- If you don’t have white wax, you can replace it with a white candle to write a message, then paint it with watercolor like you would use a crayon.
- With the lemon juice method, black paper is best.
- To read a message with lemon juice or milk, you can also place the paper under a piece of cloth and iron it to make the text appear. Another way is to put the paper in the oven at 177 degrees Celsius for a few minutes until the message appears.
- With the white crayon method, you don’t necessarily have to paint on it. Hold the paper slightly tilted in front of a window during the day. You can’t see it clearly, but you can still read it, and it’s much simpler this way.
- In the white crayon method, instead of coloring on the paper, you can also paint with a dark colored marker.
- Make sure not to mix too much water.
Warning
- Be careful not to burn or cause a fire when heating the paper.
Things you need
- Lemon juice
- Water
- Small bowl
- Spoon
- Cotton swabs, toothpicks or paintbrushes
- White paper
- Light bulb
- Baking soda
- Water
- Whisk eggs
- Paintbrush
- Grape juice
- Milk
- White wax pens
- Water color
- Rub
This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 24,357 times.
Do you want to write down your password so that no one can see it, or do you want to send someone a secret message? If you know how to write messages with invisible ink, soon you will feel like a secret agent.
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