Step 1 : Introduction to the question "Why was paper currency first printed in green?"
...In the 19th century, early counterfeiters would either pass off photographs of currency as legitimate, or they would change a bill's dollar amount by scratching off the faded ink. Green ink prevented this, as it wouldn't fade easily, and the era's black-and-white cameras couldn't duplicate the green ink of genuine currency.
Step 2 : Answer to the question "Why was paper currency first printed in green?"
It deterred counterfeiters.:
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Step 3 : Disclaimer & Terms of Use regarding the question "Why was paper currency first printed in green?"
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