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.