Prepare feathers by washing and rinsing thoroughly, or bleaching if
needed; after which mix a bath of luke warm water and starch. Enter
feathers and manipulate in bath a few seconds between the hands; after
which add a small quantity of copperas, about the size of a pea.
Enter feathers and let them remain in about half a minute; take out
feathers and add a few drops of logwood liquor; re-enter feathers and
let them remain in about half a minute; add to bath about a drop of
diluted safranine, and if shade be wanted a little on the yellow, a
drop of diluted Bismarck brown can be added. Allow feathers to remain
in until they look about three shades darker than sample; then take
out and dry as usual. If found either too dark or too light, treat
precisely as preceding color (steel). Be careful not to use starch that
has been used for an acid color.