Best friends, dark visions and wacky rococo – the week in art

Turner’s watercolours are unveiled once more in Edinburgh, while Beyond Caravaggio enters its final week – plus the rest of the week’s art happenings

Turner in January
Start the year with a dose of JMW Turner’s luminous genius in this traditional January unveiling of some of his most wondrous watercolours.
• Scottish National Gallery, Edinburgh, until 31 January.

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