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.