I’ve been thinking and reading about Turner’s color. That’s Turner’s pivotal role in the history of Western painting, after all.
In John Gage’s book Color in Turner he develops the conjecture that Turner’s color may be traced to the arrival of new pigments. It’s apparently received little study.
Just after Turner’s death, John Burnet wrote that ‘the extreme vividness of his colors, especially when his pictures were fresh from the easel, arose from the chemical changes that took place in the manufacture of the pigments during his career, such as chrome yellow, emerald green, cobalt blue, &c., which none had the courage to venture on but Turner…’