The only reason cash is green is to thwart counterfeiters

Why don't we pay for things with, say, purple or red money'Turns out making money green was a late 19th century way to thwart counterfeiters. In the decades leading up to the Civil War, currency was printed by state-backed and private banks in a variety of sizes and denominations.Then in 1861, the federal government began issuing its own currency to help finance the war.Counterfeiting was rampant at the time; clever thieves would often scratch off faded ink from bills and change the dollar amount, or they would photograph them and pass the photos off as the real thing.To prevent this, one side of these new bills was printed in a green-black ink, which was less likely to fade, says Mark Anderson, numismatic consultant at the Museum of American Finance in New York City (hence the greenbacks nickname). And since green wouldn't show up on the black-and-white-only photos of that era, it was easy to distinguish between a real bill and a photographed copy.When the feds standardized the look of paper bills in 1929, the green on the back remained because green ink was plentiful, durable and associated with 'the strong and stable credit of the government,' according to the U.S. Department of the Treasury's Bureau of Engraving and Printing, which designs and produces money.Of course, if you've taken a close look at your cash lately, you'll have noticed that bills produced in the last decade or so have splashes of subtle background color: purple, orangey copper, even blue. Did the Treasury Department hire fashionistas to spruce up our dollars' Not so much ' it's part of the ongoing effort to thwart increasingly sophisticated counterfeiting methods.RELATED: Worth It or a Waste' 6 Popular Spring Home-Renovation ProjectsSEE ALSO:'Shark Tank' investor Barbara Corcoran explains why every 20-something should spend a week using only cashJoin the conversation about this storyNOW WATCH: What happens when you eat too much protein
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