But since the variations of depth and delicacy of shades are insufficient, without the aid of colours, in this branch he likewise found for himself an ideal method, consisting of the use in their respective places, of simple tints, copied exactly from the life, or of artificial ones, intended to produce the illusion required. He was in the habit of employing only few and simple colours; but they were such as afforded the greatest variety and contrast; he knew all their gradations, and the most favourable moments for their application and opposition to each other. There appears no effort, no degree of violence in them, and that striking diversity of colours which seems to strive, one above another, for the mastery, as it were, in his pictures, has all the appearance of nature, though an effect of the most bold and arduous art. A white dress, placed near a naked figure, gives it all the appearance of being mingled with the warmest crimson, while he employed nothing beyond simple terra rossa, with a little lake in the contours, and towards the extremities. Certain objects, in themselves dark and even black, produce a similar effect upon his canvass; and which, besides enlivening the adjacent colour, give force to the figures, wrought, as was before stated, with gradual middle tints. It is said to have been his favourite opinion, transmitted to us by Boschini, p. 341, that whoever aspires to become a painter, must make himself familiar with three colours, and have them ready upon his palette; these are white, red, and black; and that an artist, while attempting the fleshy parts, must not expect to succeed at once, but by repeated application of opposite tints, and kneading of his colours. Here I shall subjoin some observations by the Cavalier Mengs, who entered so very deeply into the Titian manner. He pronounces him the first, who, subsequent to the revival of painting, knew how to avail himself of the ideal, as it were, of different colours in his draperies. Before his time all colours had been applied indifferently, and artists used them in the same measure for clear and for obscure. Titian was aware, if indeed he did not acquire his knowledge from Giorgione, that red brings objects nearer to the eye, that yellow retains the rays of light, that azure is a shade, and adapted for deep obscure. Nor was he less intimate with the effects of juicy colours, and was thus enabled to bestow the same degree of grace, clearness of tone, and dignity of colour, upon his shades and middle tints, as upon his lights, as well as to mark with great diversity of middle tints, the various complexions, and the various superficies of bodies. No other artist, likewise, was more accurately acquainted with the mutual power or equipoise of the above three colours, upon which the harmony of pictures so much depends; an equipoise, too, so difficult in practice, to which not even Rubens, however excellent a colourist, perfectly attained.