The colour of money: How the Royal Canadian Mint is using cutting-edge laser technology to give coins a surprising new look
[ad_1] Special five-kilogram silver coins produced by the Royal Canadian Mint show the famous schooner the Bluenose with the sky behind it tinted pink, blue and many shades in between. A new technique called ‘plasmonic colouring’ uses pulses of laser light to alter the surface of metals to give them bright colours without dyes or…