However I will here make him [ndr : au lecteur] an Offer of an Abstract of what I take to be those by which a Painter, or Connoisseur, may safely conduct himself, [...] V. The Colouring whether Gay, or Solid, must be Natural, Beautiful, and Clean, and what the Eye is delighted with, in Shaddows as well as Lights, and Middle Tints.
An Essay on the whole art of criticism […] ; Of the Goodness of a Picture, &c., p. 27-30
RICHARDSON, Jonathan, Two Discourses. I. An Essay on the whole Art of Criticism as it relates to Painting. Shewing how to judge I. Of the Goodness of a Picture ; II. Of the Hand of the Master ; and III. Whether ‘tis an Original, or a Copy. II. An Argument in behalf of the Science of a Connoisseur ; Wherein is shewn the Dignity, Certainty, Pleasure, and Advantage of it. Both by Mr. Richardson, London, W. Churchill, 1719.