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https://www.wikihow.it/Scrivere-un-Messaggio-con-Inchiostro-Invisibile
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Do you want to write down your password so that no one can see it or maybe you want to send a secret message to someone?Knowing how to write a message with invisible ink will give you the feeling of being a secret agent.
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Squeeze half a lemon into a bowl.
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Add a few drops of water. Mix the lemon juice and water with a spoon. -
Dip the tip of a cotton swab into the lemon juice and water mixture and write a message on a blank sheet of paper. If you prefer, you can write the message with a quill pen, toothpick, paintbrush or fountain pen.
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Let the invisible ink dry. As the ink dries, the message will disappear.
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Hold the piece of paper with the message over a light bulb, flame, or candle. Hold the paper near the light bulb or flame until the message reappears.Be careful not to get it too close to the flame if you are using a candle, lighter or stovetop.[1]Advertising
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Dip the tip of a cotton swab in a solution prepared with 50 ml of water and 50 g of baking soda. Use the cotton swab to write a message on a blank sheet of paper.
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Wait for the ink to dry.
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Dip the bristles of a paintbrush into concentrated grape juice or any dark-colored fruit juice. Swipe the juice where you wrote the message and wait for it to reappear.Advertising
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Dip the tip of a cotton swab into the milk. Pour the milk into a bowl and wet the cotton swab.
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Use the cotton swab to write a message on a blank sheet of paper. Then wait for it to dry.
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Let the milk dry for about 30 minutes.
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Expose the message to heat. You can use a light bulb, a flame, a candle or an iron.The milk will heat up at a slower rate than the paper, so the message will reappear.[2]Advertising
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Write a message on a blank sheet of paper with a white wax crayon.
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Paint on the message using a brush and watercolors. The message will reappear.[3]Advertising
This method uses pressure combined with the malleability of the paper.
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Overlay two sheets of paper. Place one sheet on top of the other.
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Write your message on the top sheet. Do this by tracing with the pen or pencil.
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Remove the first sheet of paper.
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Run a pencil over the second sheet using only the side of the lead, as if creating a shadow in a drawing. The message will reappear and look similar to chalk on a blackboard.Advertising
Advice
- For the lemon juice method, it is best to use black foil.
- For the white crayon method, you don't have to paint over it, there is an easier method to read the message:take the sheet and attach it to the glass of a window through which daylight enters.The text will not be fully visible, but you will still be able to read it.
- If you don't have a white crayon, you can use a white candle to write the secret message, then paint over the writing with watercolors as you would if you had used a crayon.
- Make sure you don't get the paper too wet.
- To read a message written with milk or lemon juice, you can place the sheet of paper under a piece of fabric and stretch it to make the text appear.Alternatively, you can place the sheet in the oven at 175°C for a couple of minutes to make the message appear.
- For the white crayon method, instead of using watercolors, you can use a dark colored marker.
- Make sure you don't use more baking soda than water.
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Warnings
- Be careful not to burn yourself or set the paper on fire to read the message.
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Things you will need
- Lemon juice
- Waterfall
- Bowl
- Table spoon
- Cotton swab, quill pen, toothpick, paintbrush or fountain pen
- Blank sheet of paper
- Lamp
- Baking soda
- Whip
- Concentrated grape juice
- Milk
- White wax crayon
- Watercolours
- Brush
Licensed under: CC-BY-SA