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All U.S. currency, from $1 to $100, has green ink on the back of the bills and black ink on the front. But if you’re like many people, you may at some point have wondered, why? The answer to this...
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Invisible ink is a topic that is both fascinating and rich in history. Undetectable by the naked eye unless accompanied by its activator (e.g. fluorescent lights, heat, lights bulbs, etc.), invisible ink is typically transparent right at printing, or very...
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The year was 1534 and a new printing & publishing house by the name of Cambridge University Press was founded. The first of its kind, it was granted letters patent by the infamous King Henry VIII. Perhaps even more astonishingly,...
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