Pitching up at an auction and picking up a lost masterpiece for a pittance is the dream for most art lovers. That seemingly happy circumstance happened to bookseller John Snare at a sale in 1845 and is the centrepiece to Laura Cumming's excellent ''The Vanishing Man – In Pursuit of Velazquez''.[[The Vanishing Man - In Search of Velazquez by Laura Cumming|Full Review]]
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