Bark from black willow trees (Salix nigra) native the east coast of the United States. Hickory bark will give a pale brown to rose-tan color on wool using an alum mordant. Willow bark dye has good washfastness and fair lightfastness. Willow bark also contains a natural catechol tanning agent used to prepared leather.
Sources Checked for Data in Record
- R.J. Adrosko, Natural Dyes in the United States, Smithsonian Institution Press, Washington, DC, 1968
- John and Margaret Cannon, Dye Plants and Dyeing, Herbert Press, London, 1994