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Page last updated at 11:08 GMT, Friday, 9 April 2010 12:08 UK

The science behind colour e-readers

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Dan Simmons has a demo of how electrowetting works - the process has been adopted by Dutch company Aquavista to create a new kind of e-reader screen.

The technology, which uses small electrical charges to move coloured oil on a display, is expected to support video.

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