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Invisible ink, also called sympathetic ink, is a kind of ink you can’t learn without using a decryption gadget. Find out how to learn secret messages written with invisible ink? Are you a London-primarily based high secret agent working for MI6 who’s been tasked with crafting secret correspondence? Working as a spy writing secret messages won’t break the bank: this kit of 12 notepads and 10 pens prices lower than $15 at the time of writing. Voters are permitted to bring their pens to mark the ballot papers. The strategy we’re going to describe is a cheap trick utilized by aspiring spies worldwide. If you want to play it old school, there’s a homemade DIY technique to put in writing secret messages: merely use a cotton swab and a few lemon juice or vinegar to pen your message.
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