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When I think of drab, I think of dull, but it actually refers to a color scheme made from quercitron dye, which includes shades of yellow, brown, orange and green. Quercitron was derived from the yellow inner bark of the black oak tree, and an Englishman observed the process in the US in 1785 and took out a patent in Britain, naming it after Quercus(oak) and Citrina(yellow). The type of mordent used to fix the quercitron dye produced the array of colors.