Turner's daringly loose brushwork and dazzling colors shine in his watercolors J.M.W. Turner, one of Britain's greatest painters, is perhaps known best for his oil paintings. But he was a lifelong watercolorist, and he fundamentally reshaped what would be understood as possible within the medium, both during his lifetime and after. Edited in partnership with Tate Britain, where the majority of the artist's works are conserved,...