Why are US dollars green?

Currency all around the world is available in a host of colourful shades, from blue to red to pink, but the US dollar bills are all green in colour and have even earned the nickname ‘greenbacks.’ There are multiple reasons for this; first, green was seen as a colour symbolising strength and stability. Second, the green pigment was easily and readily available en masse. Third, and perhaps most importantly, green was identified as the colour most difficult to photocopy, reducing the risk of counterfeit notes being produced.

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