Prepare a warm bath with five per cent. bisulphate of soda, add
solutions of azo orange, acid violet and some archil cautiously in
several doses until the bath has the desired color. Enter the scoured
and rinsed feathers and agitate for fifteen or twenty minutes, to
produce a level dye; then raise the temperature slowly to 190-200° F.,
dye for a few minutes longer, lift, rinse and dry.
By varying the proportions of the dyestuffs, drab, wood brown, lead
color, etc., can be obtained, and olives by increasing the quantity of
acid violet and omitting the extract of archil.