MUSHROOM.
I. For this elegant color take naturally white or bleached gray feathers, scour and rinse them well. Prepare a hot bath with five per cent., of the weight of feathers, bisulphate of soda, to which add, as required, filtered solutions of fast yellow, indigo carmine and ponceau G. Enter the feathers at 170° F., work them for ten or fifteen minutes and raise the temperature slowly to near the boiling point. Add the dyestuffs in small quantities gradually, making the additions only when the dyestuff of the bath has been completely absorbed, and then by drops so as to be able to correct the color without waste of dyestuff. Bear in mind, that the indigo carmine dyes up slowly and requires a high temperature. An easier process is, therefore, the following:
II. After cleaning and rinsing well, prepare a bath at 170° F., with four per cent. bisulphate of soda, to which add gradually in small quantities, as required, some nigrosine, azo orange and a little mandarin or nigrosine, alkaline blue and fuchsine S., rinse, starch and dry.