Even so, it would seem that full colour, fully flexible displays that can switch fast enough to show video are still some way off.

ECONOMIST: REPORTS

It was sometime before full colour transmission was widespread.

BBC: Pioneering colour photography

"Mexico was an absolute change, it was full of colour, full of sun, so unlike Europe, " he says.

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The leaves on the trees have begun to smoulder, not yet set alight with full autumn colour.

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Add appropriate filters, and the whole thing produces a full-colour moving image.

ECONOMIST: Curtains for celluloid

His characters all wrote letters or diaries full of colour and circumstance.

ECONOMIST: Constable's early life

Colour is added by using three separate arrays, each fitted with a filter for one of the primaries red, green and blue that, in combination, produce a full-colour image.

ECONOMIST: Curtains for celluloid

Now two fascinating new books on Sienese painting, as well as a recent exhibition, tell the story of early Italian art from the Sienese viewpoint, full of colour, emotion and narrative detail.

ECONOMIST: Italian painting: A touch of heaven | The

So we get to see the full beauty of the colour spectrum.

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The royal couple watched 200 soldiers parade through the square, bringing a splash of colour to the occasion in their full ceremonial uniform of scarlet tunics and bearskins, and led by the Band of the Irish Guards.

BBC: Duchess of Cambridge hands out shamrocks to soldiers