or sullied.
905.
This method had many advantages; for the painter had a light ground for the light portions of his work and a dark ground for the shadowed portions. The whole picture was prepared; the artist could work with thin colours in the shadows, and had always an internal light to give value to his tints. In our own time painting in water colours depends on the same principles.
906.
Indeed a light ground is now generally employed in oil-painting, because middle tints are thus found to be more transparent, and are in some degree enlivened by a bright ground; the shadows, again, do not so easily become black.
907.
It was the practice for a time to paint on dark grounds. Tintoret probably introduced them. Titian's best