SILVER GRAY.
Scour, respectively bleach, and rinse the feathers well clean, prepare a bath, work the solution of five per cent., of the weight of feathers, silver gray (Actein Gesellschaft fuer Anilin Fabrikation, Berlin), feebly acidulated with sulphuric acid; enter the feathers in the cold, work well to make the color dye up evenly; then raise the temperature slowly under diligent working, to 170° F., continue at this temperature for five to ten minutes, lift, rinse and dry.