It is for this dye particularly important that the bisulphate of soda used be crystallized, that is, pure bisulphate free from surplus sulphuric acid, while the commercial article is often nothing but a mixture of Glauber salt (sulphate of soda) into sulphuric acid, answer for this dye.
A good reseda is also easily obtained by adding to the acidulated bath small quantities of decoction of logwood and turmeric, so as to give a feeble bath. Enter the scoured and bleached feathers, after rinsing, at 170° F., work them for about fifteen minutes, until level, and sadden with a little solution of blue stone. Rinse, starch and dry as usual.
ORDINARY GREEN.
For two and one-half pounds of feathers boil two and one-half pounds of fustic for one-half hour with three quarts of water, pour the decoction off and boil the chips again for one-half hour with three quarts of water, mix the two decoctions and strain. Add three ounces alum and one and one-half ounces tartar, enter the feathers well scoured and rinsed, and dye to shade at 170° F. Or, prepare the dyestuffs of decoction of fustic or turmeric, and indigo carmine, according to shade, enter at 170° F., work for one-half hour while slowly raising the temperature to near the boiling point, and dye to sample; lift, rinse, squeeze and starch as usual.
LIGHT GREEN.
I. Scour, respectively bleach, and rinse the feathers. Prepare a hot bath with the solution of forty per cent., of the weight of feathers, tannin, and treat the feathers in it for 1 hour at 170°F. Prepare a bath with a filtered solution of methyl green, according to shade, tone, if a yellowish green is wanted, with the clear solution of picric acid, and dye to sample at 150° F. Lift, squeeze and starch without rinsing.
II. A better color is obtained upon a lightly acidulated bath (with sulphuric acid) with acid green, malachite green, fast green, etc., that is, with the filtered solutions of these dyestuff's, added to the bath in quantities of from ten to twenty per cent. to suit the shade. Enter at 170° F.; dye for twenty or thirty minutes, lift, rinse, squeeze and dry with starch. If a yellowish tone is wanted, add the clear solution of picric acid, or of acid yellow.
MOSS GREEN.
Scour and rinse the feathers well; for dark shades unbleached grays may be used. Prepare a feebly acidulated bath with sulphuric acid, at a temperature near the boiling point; add turmeric freely and Guinea green G less. Enter the feathers and manipulate at the same temperature for fifteen or twenty minutes, according to the desired tone, re-enter and dye to shade.
By varying the proportions of the three dyestuffs, a great variety of green-brownish modes can be produced, which approach medium and dark bronzes the more the fast brown predominates in the composition of the color.