I. The feathers being scoured and rinsed clean of soap, prepare a bath
of five per cent., of the weight of feathers, bisulphate of soda,
add solution (filtered) of azo orange, according to shade. Enter the
feathers at 120° F.; heat up slowly to 170° F., while working the
feathers; lift when the shade is obtained, squeeze out, starch and dry.
II. Prepare a bath with three per cent. (of the weight of the feathers)
Glauber salt and one per cent. sulphuric acid. Enter the feathers at
100-120° F., after adding to the bath the solution of one per cent.
golden yellow S. (of Gust. Doerr, Frankfort-on-Main), work the feathers
repeatedly during one-half hour, when they all have assumed a rich,
nourished color; take up, rinse lightly; starch and beat them dry.