So the organisation that Ms Jana works for, the Durbar Mahila Samanwaya Committee, has put a machine in its office that uses ultraviolet light to detect forgeries.

BBC: Teaching Indian sex workers to spot fake currency

"It is in much the same way as you book a movie ticket by phone or online these days using your credit card and then when you get there you access your ticket through an ATM-type machine, " said Will, who is chairman of the World Cup ticketing sub-committee.

BBC: Fans get World Cup ticket boost