quercitron (dye) en

Flavonoid compound used as a yellow dye, obtained from the bark of the black oak, Quercus velutina, native to the eastern and midwestern United States. The outermost layer of bark gives a bright yellow dye while the inner bark gives a darker oranges and tans. Used to dye wool bright yellow or orange. At one time this colorant was used with cochineal to produce scarlets of particular brilliance. Quercitron was introduced in England in 1775 by Edward Bancroft as a substitute for weld.