(1) Methyl, 11 Lb
Dissolve in boiling water 7 1/10 oz. tannin; lay the bleached cotton overnight in the hot solution; wring out; dye in cold water with a solution of the colour according to shade. Wring out, and dry in the dark without washing.
(2) For 22 Lb
For lighter shades, bleach well, and work in warm soap beck, to remove chlorine. Enter into a boiling lye of curd-soap, and wash out in cold water. Make up a cold dye beck with 3 parts colour to every 100 of cotton, give 5 to 6 turns, and let steep overnight. Dry the next morning. If the shade is not full enough, take through the tannin beck, and dye again to shade.
This can be dyed in the same manner as methyl green; but it is not sensitive to heat, and admits, if required, of the presenoe of small quantities of acids.
This colour dyes dark-green shades, though its name would lead us to expect sky-blues. For dyeing cotton, 2 lb. 3 oz. of the colour should be stirred up with twice its weight of bisulphite of soda at about 78° Tw.; the mixture may stand for some hours before it is added to the dye-beck.
The cotton-yarns to be dyed are mordanted by passing alternately through chromate of potash and bisulphite of soda. The necessary quantity of colour, according to the shade required, is then added to cold water; the yarn is entered, and the heat is gradually raised to a boil. The shade obtained bears soaping and exposure to air, as-well as do the alizarine colours.
(5) Dark, 50 Lb
Steep for 6 hours in a decoction of 10 lb. sumach; wring, and enter into a fresh cold beck made up of 3 lb. alum, 9 oz. methyl green of a bluish shade, and 2 pails fustic liquor. Turn quickly, raising the temperature to 150° F. (66° C.); when the dye is exhausted, dissolve 3 to 4 oz. copperas in the same liquor, and give 3 to 4 turns, to sadden.
(6) Ordinary, 100 lb. yarn. - Dissolve 10 lb. nitrate of iron, and 1 lb. tin crystals; work the yarn in this solution cold; give 5 turns, and wring. In another beck dissolve 6 lb. yellow prus-siate; give the yarn 5 turns in the cold solution; wring, and pass back into the nitrate of iron, and thence back into the prussiate beck, to which 2 lb. alum have been added; give 5 turns in each, and rinse.
Boil 40 lb. bark for 1 hour, strain into a tub, add 1 lb. sugar of lead, well dissolved; when all is well mixed, enter the yarn at 180° F. (82° C), and work for 1/2 hour; lift, wring, and pass through another beck containing 2 lb. alum, and 2 lb. indigo paste. Rinse, and dry.
(7) Boil 25 lb. fustic in a bag, and add to the liquor 2 1/4 lb. verdigris previously dissolved in vinegar and hot Water; cool the dye; enter the yarn, which has been prepared overnight in a decoction of sumach; handle it well, and heat up to a boil, working for 1/2 hour. Cool it and enter it into another beck, containing a decoction of 10 lb. logwood. Heat up to a boil, and work 1/2 hour; take out, rinse, and dry.
If blue vitriol is used instead of verdigris, an olive green is obtained.
Give the yarn a blue bottom in the vat; take through dilute sulphuric acid, and wash very well. Take through sugar of lead solution at 6° Tw., then through caustic soda lye at 2° to 3° Tw., and wash off. Enter into bichromate bath at 2° Tw. Each operation requires 5 to 6 turns. Wash off and dry.