SPANISH WHITE (n.)
PEACHAM, Henry, The Gentlemans Exercise. Or, An exquisite practise, as well for drawing all manner of Beasts in their true Portraitures : as also the making of all kinds of colours, to be used in Limning, Painting, Tricking, and Blazon of Coates, and Armes, with divers other most delightfull and pleasurable observations, for all young Gentlemen and others. As also Serving for the necessary use and generall benefit of divers Trades-men and Artificers, as namely Painters, Ioners, Free-Masons, Cutters and Carvers, &c. for the farther gracing, beautifying, and garnishing of all their absolute and worthy pieces, either for Borders, Architects, or Columnes, &c., London, J. Legat, 1634.1 quotations
The First Booke of Drawing and Limning, Chap XXIII, The Etymologie and true mixture of colours, p. 74
the principal whites in painting and limning are these. viz.
Spanish White. [...] Spanish White.
There is another white called Spanish white, which you may make your selfe in this manner, […] : it is the best white of all others to lace or garnish, being ground with a weake gumme water.