Scientists change colour of gold

London: 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 like silver and aluminium, this breakthrough opens up the prospect of colouring metals without having to coat or chemically treat them, delivering valuable economic, environmental and other benefits. 
    The technique could also be harnessed in a wide range of industries like manufacturing jewellery to making banknotes and documents harder to forge. 
    It can be used to produce a wide range of colours on a given metal. ANI