If the artist abandons himself to his feeling, colour presently announces itself. Black no sooner inclines to blue than the eye demands yellow, which the artist instinctively modifies, and introduces partly pure in the light, partly reddened and subdued as brown, in the reflexes, thus enlivening the whole.—Note GG.
864.
All kinds of camayeu, or colour on similar colour, end in the introduction either of a complemental contrast, or some variety of hue. Thus, Polidoro in his black and white frescoes sometimes introduced a yellow vase, or something of the kind.
865.
In general it may be observed that men have at all times instinctively striven after colour in the practice of the art. We need only observe daily, how soon amateurs proceed from colourless to coloured materials.