The other new technology in development uses colour in a rather more literal sense.

ECONOMIST: Wine-tasting will never be the same again

It's just a picture of a tartan ribbon and may seem unremarkable, yet it marks a crucial moment in the development of colour photography and forms the basis of the photographs we take today.

BBC: Pioneering colour photography

The drawbacks of electrophoretic displays are that they have slow response times, since the pigment particles take time to move, and that colour versions are still in development.

ECONOMIST: REPORTS