Day: July 2, 2015

The secret codes of British banknotes

BBC NEWS Future | By Chris Baraniuk | June 25, 2015 How often have you looked at the cash in your wallet? Look closer: it’s riddled with hidden patterns designed to deter counterfeiters. Chris Baraniuk investigates. A brand-new Xerox colour photocopier had just arrived at one of Cambridge’s industrial labs. It was the early 2000s, and word