Scientists change the colour of gold

In a breakthrough, scientists have for the first time found a way to change the colour of the world’s most iconic precious metal – gold.
Researchers from the University of Southampton have discovered that by embossing tiny raised or indented patterns onto the metal’s surface, they can change the way it absorbs and reflects light – ensuring our eyes don’t see it as ‘golden’ in colour at all. Equally applicable to other metals such as silver and aluminium, this breakthrough opens up the prospect of colouring metals without having to coat or chemically treat them. This could deliver valuable economic, environmental and other benefits.The technique could be harnessed in a wide range of industries for anything from manufacturing jewellery to making banknotes and documents harder to forge.
“This is the first time the visible colour of metal has been changed in this way,” said Professor Nikolay Zheludev, Deputy Director of Southampton’s Optoelectronics Research Centre, who led the project.

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