Physicists have found a way to control the way metals reflect and refract light, giving rise to the possibility of making silver gold, purple silver, or blue bronze.
The group from Harvard's School of Engineering and Applied Sciences were inspired by the swirls of colours found in slicks of oil floating on water, which refract water in weird and strangely beautiful ways. It turns out that the colour of an object can be controlled in almost exactly the same way by using an extremely thin layer of germanium, where changing the thickness of the layer by only a few atoms at a time can lead to huge changes in colour.
By: Ian Steadman, Edited by: Olivia Solon
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via Wired.co.uk
http://www.wired.co.uk/news/archive/2012-10/16/thin-metal-colour-change-art
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