LITMUS BLUE (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 principal blewes with us in use are,
Korck or Orchall.
Take fine Bice and grinde it upon a cleane stone, […].
Take fine Litmose, and grinde it with Ceruse, […].
Take Indebaudias and grinde it with the water of Litmose, […].
Take Florey Blew, and grinde it with a little fine Roset, […].
Korke or Orchall.
Take fine Orchall and grinde it with unflekt lime […].
BROWNE, Alexander, Ars Pictoria : or an Academy Treating of Drawing, Painting, Limning, Etching. To which are Added XXXI. Copper Plates, Expressing the Choicest, Nearest, and Most Exact Grounds and Rules of Symmetry. Collected out of the most Eminent Italian, German, and Netherland Authors. By Alexander Browne, Practitioner in the Art of Limning. The Second Edition, Corrected and Enlarged by the Author, London, Arthur Tooker - William Battersby, 1675.1 quotations
As for Vermillion, Verdigrease, Orpiment, &c. they are too course and gritty to use in water colours ; Turnsoile, Litmus blew, Rosset, Brasil, Logwood, Saffron, are more fit for washing prints then curious Limning.