YEAST, is the froth of fermenting worts. See Beer and Fermentation.

YELLOW DYE. (Teinture jaune, Fr.; Gelbfarben, Germ.) Annotto, dyer’s-broom (Genista tinctoria), fustic, fustet, Persian or French berries, quercitron bark, saw-wort (Serratula tinctoria), turmeric, weld, and willow leaves, are the principal yellow dyes of the vegetable kingdom; chromate of lead, iron-oxide, nitric acid (for silk), sulphuret of antimony, and sulphuret of arsenic, are those of the mineral kingdom. Under these articles, as also under Calico-printing, Dyeing, and Mordants, ample instructions will be found for communicating this colour to textile and other fibrous substances. Alumina and oxide of tin are the most approved bases of the above vegetable dyes. A nankin dye may be given with bablah, especially to cotton oiled preparatory to the Turkey-red process. See Madder.

YELLOW, KING’S, is a poisonous yellow pigment. See Arsenic and Orpiment.

YTTRIA, is a rare earth, extracted from the minerals gadolinite and yttrotantalite, being an oxide of the metal yttrium.