Let’s imagine that you have, in your family, a pretty landscape that everyone thinks is by Signac. Or a Warhol silkscreen that your father bought from a friend in the days when they cost peanuts. Or that the squiggly painting you picked up at a car boot sale could, just possibly, be a Jackson Pollock. All that is needed is get it authenticated and your artwork could be worth, literally, a fortune – in the case of the Pollock, a cool £25m. And the Signac and the Warhol could sell for six figures. But if they are fakes or copies, they would be virtually worthless. So how do you find out if your artwork is the genuine thing? There is simply no sure-fire way of authenticating art, once the artist has died. It’s not that the means are lacking; in fact there is a host of expertise available. But there are “good” and “bad”...
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