Some declassified secrets

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Jack Shalom
Posts: 1376
Joined: February 7th, 2008, 12:00 pm
Location: Brooklyn NY

Some declassified secrets

Postby Jack Shalom » September 16th, 2016, 8:39 am

From our friends at the CIA: invisible ink formulae and how to read a sealed envelope:

http://www.dailymail.co.uk/news/article ... e-ink.html
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