PUCE.
Scour and rinse the feathers well; grays can be used in their natural color without bleaching. Prepare a warm bath, in which dissolve eighty per cent., of the weight of feathers, tartaric acid and eighty per cent. Glauber salt; then add sixteen per cent. aniline fast brown; eight per cent. azo yellow, and sixteen per cent. induline or nigrosine, and bring the bath to a boil; after a few minutes of boiling, chill by the addition of cold water, enter the feathers and work them at hand-heat for fifteen or twenty minutes until the color has become level; then bring the bath again to near the boiling point; lay the feathers down in the bath, shut off the steam, or withdraw from the fire, and let the bath cool down. When cold, that is in about one or two hours, take out the feathers, rinse and dry.