Note 226 — Chapter XI · (XXV.)

The clay or earth that Vasari speaks of forms the body of the ‘distemper’ or ‘gouache,’ as it would be called respectively in Britain and in France, and takes the place of the ‘whitening’ used in modern times. Baldinucci in his Vocabolario explains ‘Terra di cava o Terretta’ as ‘the earth (clay) with which vessels for the table are made, that mixed with pounded charcoal is used by painters for backgrounds and monochromes, and also for primings, and with a tempera of size for the canvases with which are painted triumphal arches, perspectives, and the like.’ It is of very fine and even texture, and Baldinucci says it was found near St. Peter’s at Rome, and also in great quantity at Monte Spertoli, thirteen miles from Florence.