CCXXI On Gainsborough
We must not forget, whilst we are on this subject, to make some remarks on his custom of painting by night, which confirms what I have already mentioned,—his great affection to his art; since he could not amuse himself in the evening by any other means so agreeable to himself. I am indeed much inclined to believe that it is a practice very advantageous and improving to an artist: for by this means he will acquire a new and a higher perception of what is great and beautiful in nature. By candlelight not only objects appear more beautiful, but from their being in a greater breadth of light and shadow, as well as having a greater breadth and uniformity of colour, nature appears in a higher style; and even the flesh seems to take a higher and richer tone of colour. Judgment is to direct us in the use to be made of this method of study; but the method itself is, I am very sure, advantageous. I have often imagined that the two great colourists, Titian and Correggio, though I do not know that they painted by night, formed their high ideas of colouring from the effects of objects by this artificial light.
Reynolds.