quercitron

[ kwur-si-truhn ]

/ ˈkwɜr sɪ trən /

an oak, Quercus velutina, of eastern North America, the inner bark of which yields a yellow dye.

the bark itself.

the dye obtained from this bark.

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1785–95; <Latin quer(cus) oak + citron

The same mordants, with a dye of quercitron bark, give yellow and olive or drab.
Popular Technology, Vol. I (of 2)|Edward Hazen
In winter they are passed through a slightly chalky water, then washed at the wheel, and dyed in quercitron or weld.
A Dictionary of Arts, Manufactures and Mines|Andrew Ure
Flavin is extract of Quercitron bark, and is much used for bright yellow with tin.
Vegetable Dyes|Ethel M. Mairet
Quercitron, a yellow dye obtained from the bark of a North American oak.
The Nuttall Encyclopaedia|Edited by Rev. James Wood

According to Bancroft, Quercitron is the yellow above all others for dyeing greens.
Vegetable Dyes|Ethel M. Mairet