102
Francia's friendship with Raphael, on which art historians have based many theories and spun many interesting tales, is now discredited, the documents in question being comparatively modern forgeries (see p. 366 of Kugler's
103
Vasari's story that Francia died of chagrin on seeing how far the whole work of his own life was transcended by Raphael's picture of St. Cecilia, which was sent to its destination at Bologna about 1516, is hardly credible.
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Ruskin said of this picture in 1847: "The attribution to him of the wretched panel which now bears his name is a mere insult" (
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Up to the time of the Van Eycks the general process of artistic painting for detached pictures was tempera. In this method the colours, after being ground with chalk, were laid on with a medium of water, white of eggs, juice of unripe figs, or some similar substance. Some kind of oil varnish was, however, often laid on afterwards, and a few Italian artists sometimes tried to mix their colours with oil in the first instance; but the results cannot have been satisfactory, for even Crivelli, who died in 1495, was still exclusively a painter in tempera. The objection to tempera, so far at any rate as northern countries were concerned, was that it suffered from the damp. Thus in an old retable in Westminster Abbey, so painted, the painting has flaked off. The objection to the early attempts at using oil as a medium was that it took a long time to dry. This caused Van Eyck incessant annoyance; his knowledge of chemistry led him to make experiments, and at last he obtained a medium which hastened the drying without the necessity of exposure to the sun. This medium was probably a mixture of linseed and nut oils. This method is different from that now called oil-painting. Now the colours are laid on by an oily medium, and when the picture is finished the whole surface is protected by a transparent varnish. Then the varnish was incorporated with the surface colours (see Conway's