DYEING OF WooL.—In the dyeing of woolen yarn and cloth, the various steeps are used warm, but the washings in water are done cold. Care must be taken to remove every particle of grease from the wool by washing with soda and soap, before it is sub jected to the process of dyeing, else the coloring matters will not adhere. The more common and important colors are obtained as follows: 19. Black—by working the cloth in a bath of camwood, then of copperas; after which wash out; then treat with decoction of logwood and copperas: or work in a bath of bichromate of potash, alum, and fustic; lift, and expose to the air; then immerse in decoction of logwood, barwood, and fustic; thereafter of copperas.
20. goods are worked in a bath of fustic, madder, peachwood, and log wood; then introduce into dilute solution of copperas: or the goods are treated with a bath of bichromate of potash, argol, and alum, washed, and then introduced into a bath of fustic, madder, peachwood, and logwood.
21. Red—by working in a decoction of bichromate of potash and alum, and subse quently in a bath of peach or lima wood, with a little alum. Scarlet is obtained from cream of tartar, cochineal, sumach, and fustic.
22. Crimson—from cochineal, cream of tartar, and chloride of tin. Cudbear gives a wine tint.
23. Pink.—Work the goods in a bath of tartar, alum, cochineal, and red spirits.
24. Orange—from a bath of sumach, cochineal, fustic, tartar, and red spirits.
25. Yellow—from a bath of tartar and alum; then a decoction of bark, sumach, fus tic, and red spirits.
26. shades may be obtained from immersion in salts of iron, and then in solutions of yellow prussiate of potash (see 12). Also work the wool in a bath of argol, alum, and indigo extract.
27. Green.—Work the goods in a bath of fustic, argol, and alum, and thereafter in a solution of indigo. The dark shades of green, such as olive, are brought out by a bath of fustic, logwood, madder, and peachwood, and afterwards of copperas.
28. no/et—from cudbear, logwood, barwood, or camwood, and peachwood; as also alum. The addition of copperas brings out a puce tint.
29. Drab.—The manifold shades of this color are procured from variable strengths of decoctions of madder, peachwood, logwood, fustic, associated with alum and cop peras.