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Secrets of confidential ink, stealth ink
After writing and drawing, I saw nothing. Reason? Use security ink, also called invisible ink.
Stealth Ink
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Articles about Stealth Ink
4 published items.
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Ways to create a stealth letter from the most basic items
Creating a stealth mail is a lot easier than you think, simply using things around.
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Secret of the 'invisibility' letter of spies
The US Central Intelligence Agency (CIA) recently released classified documents showing that World War I spies had printed messages on their toenails and used lemonade t…
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Materials known as 'self-destructive timers' can cause ink to disappear
The secret behind these self-destructive molecules is that they need a small amount of energy to survive - and when that energy is gone, they will disappear.