Callum Innes is one of Britain’s best-known abstract painters. His constantly evolving practice is as much about un-painting as it is about painting. In his ongoing series, Exposed Paintings, layers of black oil paint are gradually removed to reveal a deep violet, or green. In his powerful and evocative series, Monologues the washes create a visual effect like a waterfall or a mist; a natural, shifting phenomenon. This exhibition also shows a selection of works on paper and new watercolours made especially for the Whitworth. #CallumInnes