quercitron bark

quercitron bark

▪ plant anatomy
      inner bark of the black oak, Quercus velutina, which contains a colouring matter used to dye wool bright yellow or orange. At one time this colorant was used with cochineal to produce scarlets of particular brilliance.

      To obtain the colouring matter, the exterior bark is shaved from the tree, which is native to the middle and southern United States, to expose the inner bark, which is then detached, ground, and subjected to hot water under pressure. The extract deposits a crude quercetin known commercially as yellow flavine. A second variety, known as red flavine, is deposited when an extract of the bark is digested at the boil with dilute acid. These products are used to dye wool mordanted (fixed) with aluminum or tin compounds to bright shades of yellow and orange.

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Universalium. 2010.

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  • Quercitron — is a yellow dye obtained from the bark of the Eastern Black Oak ( Quercus velutina ), a fine forest tree indigenous in North America. The name is a shortened form of quercicitron, from Latin quercus , oak, and citron , lemon, and was invented by… …   Wikipedia

  • Quercitron — Quer cit*ron, n. [F. quercitron, the name of the name of tree; L. quercus an oak + citrus the citron tree.] 1. The yellow inner bark of the {Quercus tinctoria}, the American black oak, yellow oak, dyer s oak, or quercitron oak, a large forest… …   The Collaborative International Dictionary of English

  • quercitron — [kwʉr′si trən, kwər sit′rən] n. [< ModL quercus < L, oak (see QUERCETIN) + CITRON] 1. the inner part of the bark of a North American black oak (Quercus velutina), containing tannin and used in tanning and dyeing 2. a yellow dye made from… …   English World dictionary

  • quercitron — noun 1. a yellow dye made from the bark of the quercitron oak tree • Hypernyms: ↑dye, ↑dyestuff 2. medium to large deciduous timber tree of the eastern United States and southeastern Canada having dark outer bark and yellow inner bark used for… …   Useful english dictionary

  • quercitron oak — noun medium to large deciduous timber tree of the eastern United States and southeastern Canada having dark outer bark and yellow inner bark used for tanning; broad five lobed leaves are bristle tipped • Syn: ↑black oak, ↑yellow oak, ↑quercitron …   Useful english dictionary

  • quercitron — Quercitrin Quer cit*rin, n. [Cf. F. quercitrin. See {Quercitron}.] (Chem.) A glucoside extracted from the bark of the oak ({Quercus}) as a bitter citron yellow crystalline substance, used as a pigment and called {quercitron}. [1913 Webster] …   The Collaborative International Dictionary of English

  • quercitron oak — Oak Oak ([=o]k), n. [OE. oke, ok, ak, AS. [=a]c; akin to D. eik, G. eiche, OHG. eih, Icel. eik, Sw. ek, Dan. eeg.] [1913 Webster] 1. (Bot.) Any tree or shrub of the genus {Quercus}. The oaks have alternate leaves, often variously lobed, and… …   The Collaborative International Dictionary of English

  • quercitron — noun Etymology: blend of New Latin Quercus and International Scientific Vocabulary citron Date: 1794 1. a large timber oak (Quercus velutina) chiefly of the eastern and central United States 2. the bark of the quercitron that is rich in tannin… …   New Collegiate Dictionary

  • quercitron — /kwerr si treuhn/, n. 1. an oak, Quercus velutina, of eastern North America, the inner bark of which yields a yellow dye. 2. the bark itself. 3. the dye obtained from this bark. [1785 95; < L quer(cus) oak + CITRON] * * * …   Universalium

  • quercitron — quer•ci•tron [[t]ˈkwɜr sɪ trən[/t]] n. 1) pln an oak, Quercus velutina, of E North America: the inner bark yields a yellow dye 2) pln the bark itself 3) the dye • Etymology: 1785–95; < L quer(cus) oak +citron …   From formal English to slang

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