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A classic black dress is perfect for a black-tie wedding, but you must ensure its not too short or revealing

But those who thought it was illuminated by artificial light were more likely to see it as black and blue

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'This is a basic cognitive function to appreciate the colour on an object, the illumination source has to be taken into account, which the brain does continuously.' Dr Paul Knox, formerly at the University of Liverpools Department of Eye and Vision Science, said 'colour isnt something that exists in the world'