Have the naturally white or decolorized gray feathers well washed in
soap and rinsed clean from it. Prepare a hot bath at 170° F., to which
add so much aniline cream as to color it dark reddish yellow. Enter the
feathers and agitate them from five to ten minutes, according to the
shade desired. Then take them up, add some sulphuric acid to the bath,
re-enter the feathers, work for two minutes; then lift, rinse and dry.
The bath can be preserved for further use.