Make a se­cret spy mes­sage!

Cosmos - - Cosmos Science Club -

Se­cret agents ev­ery­where have to be able to write mes­sages that other peo­ple can’t see, and the best way to do that is to use in­vis­i­ble ink. Real spies from ASIO or the CIA or MI5 prob­a­bly use su­per- se­cret in­vis­i­ble inks made by sci­en­tists deep in­side su­per- se­cret lab­o­ra­to­ries in su­per- se­cret un­der­ground bases, but you can make your own just by us­ing a cou­ple of things hang­ing about in your house.

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