Of the earlier Spanish writers Pacheco may be mentioned next to Palomino as containing most practical information. Carducho, De Butron, and others, seldom descend to such details. Palomino contains all the directions of Pacheco, and many in addition.

See Cean Bermudez, "Sobre la Escuela Sevillana," Cadiz, 1806. The same reasons induced the later Venetian machinists to paint on dark grounds, and to make use of (drying) oil in excess. See Zanetti, Della Pittura Veneziana, 1. iv.

Borghini, in describing the method of making a gold-size (the same as Cennini's), speaks of boiling the "buccie de' colori" in oil; this only means the skin or pellicle of the colour itself—in fact, he proceeds to say that they dissolve in boiling. Vasari, in describing the same process, uses the expression "colori seccaticci."