3. (French white lead; Blanc de plomb, Fr.) From litharge dissolved in vinegar, and the lead thrown down by a current of carbonic acid gas from coke. Does not cover so well as flake white.
4. (Grace’s white lead.) Made from sheet lead, with the refuse water of the starch-maker’s, soured brewer’s grain, &c.
5. (Hamburg white, Hamburg white lead.) From flake white, 1 cwt.; cawk, 2 cwt. Also sold for best Dutch white lead.
6. (Venetian white, Venetian white lead; Cerusa Veneta, L.) From flake white, or pure white lead and cawk, equal parts. (See below.)
White Precip′itate of Lead. Syn. Miniature painter’s white, Sulphate of lead. From an acetic or nitric solution of litharge,
precipitated by adding dilute sulphuric acid, and the white powder washed and dried. The clear liquid decanted from the precipitate is poured on fresh litharge, when a second solution takes place; and this may be repeated for any number of times. Used in miniature painting, being a beautiful and durable white.
Whi′′ting. The same as prepared chalk, but prepared more carelessly, in horse-mills.
White, Wilkinson’s. From litharge ground with sea water until it ceases to whiten, and then washed and dried.
White, Zinc (Hubbuck’s). A hydrated oxide of zinc. It possesses the advantage of being innocuous in use, and not being blackened by sulphuretted hydrogen, like white lead.
WHITE PIG′MENTS. Syn. Pigmenta alba, L. The following list embraces the more important white pigments of commerce: