Europe's monetary authorities on Tuesday began rolling out a new orange-brown 50-euro banknote - the eurozone's most frequently forged bill - with new features designed to guard against counterfeiting.
More than half of all counterfeit euro banknotes last year were 50-euro bills, Germany's Bundesbank said.
The 50 bill is also the most used note in circulation in the 19-member eurozone.
"Even in this digital age, cash remains essential in our economy," said European Central Bank President Mario Draghi.
He said that a survey carried out the ECB's behalf found that more than three-quarters of all payments at points-of-sale in the eurozone were in cash.
Among the new 50-note's security measures that are aimed at making life more difficult for forgers, the authorities have included a transparent window featuring a portrait with a watermark of "Europa" a Greek goddess on a metallic strip.
The new 20-euro note introduced in 2015 also includes a similar security feature.
The authorities improved the security on the 10-euro note in 2014. The 100- and 200-euro notes are also expected to undergo a revamp.
Another safety feature of the new 50-euro note is that the printed numeral is emerald green in colour but changes to deep blue depending the light and viewing angle.
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