The Bank of England confirmed that the five-pound note contained tallow - rendered fat from beef and mutton that's solid at room temperature - in a tweet on Monday.
"The new five-pound notes contain animal fat in the form of tallow".
The Bank of England, which has already printed 440 million new 5-pound notes, has not announced plans to change the make-up of its bills.
It's easy to see why people who avoid eating products made from animals are suddenly up in arms over having to pay using money made from animals.
"It would be good if [the Reserve Bank] looked at sourcing a product that didn't involve the use of animal products", he said.
We were all excited about the new £5 notes.
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Clive Shrubsole, a researcher at University College London and a vegetarian, called for the notes to be removed from circulation. The Bank claims it was unaware of the traces of tallow when it signed the production contract with supplier Innovia. UK, which was concerned about the shape of chocolate bar Toblerone than Donald Trump getting elected as USA president and the note ban chaos in India, is now protesting against a new note introduced in their country.
Trupti Patel, President of the Hindu Forum of Britain, which represents over 300 Hindu organisations, expressed her surprise about the move, which, she said, contrasted with the largely inclusive and sensitive approach of United Kingdom authorities to the concerns of different faith groups.
A petition was launched calling on the production of the plastic fivers to be stopped - and it has quickly gained more than 100,000 signatures.
The notes, which bear a portrait of Sir Winston Churchill, are 15 per cent smaller than the paper notes they are replacing and are said to last more than twice as long.
Vegans have said they plan to boycott notes containing animal produce.
Patricia Potts, a spokeswoman for Innovia Films, confirmed that a supplier had used tallow to help make the material more "anti-static".