| 单词 | quercitron |
| 释义 | quercitron|ˈkwɜːsɪtrən|
[Abbreviated for querci-citron, f. L. quercus oak + citron. Named by Dr. Bancroft about 1784.]
1. a. The black or dyer's oak of N. America (Quercus tinctoria): also called quercitron oak. b. The inner bark of this, used as a yellow dye and in tanning: also quercitron bark.
1794Bancroft Philos. Perman. Colours xii, The Quercitron bark..is one of the objects of a discovery, of which the use and application for dying, calico-printing, &c. are exclusively vested in me..by an act of parliament passed in the 25th year of his present Majesty's reign. 1852C. Morfit Tanning & Currying (1853) 100 The black, or quercitron oak, is a large tree found throughout the United States. Ibid. 101 The quercitron, so much used in dyeing, is obtained from the cellular integument.
attrib.1823Ure Dict. Chem. (ed. 2) 398/1 Cloth..subjected to the quercitron bath.
2. Special Combs. quercitron lake, yellow, the yellow pigment obtained from quercitron bark, yielding quercetin and rhamnose on hydrolysis; quercitrin.
1886H. C. Standage Artists' Man. Pigments iv. 43 Yellow Lakes (Madder Yellow,..Quercitron Yellow or Lake). 1918Perkin & Everest Natural Org. Colouring Matters xix. 628 Quercitron-yellow lake, Flavin-lake, or Dutch pink can be made..by precipitating a decoction of quercitron bark containing alum with chalk. 1934Quercitron lake [see Italian pink]. 1947L. S. Pratt Chem. & Physics Org. Pigments vii. 65 Quercitron lake is a yellow coloring matter made from the inner bark of a species of oak, Quercus tinctoria, that is indigenous to North America.
Hence querˈcitrein, a product of quercitrin. ? Obs. querˈcitric a., derived from quercitrin, as in quercitric acid (Watts Dict. Chem. 1868). ˈquercitrin, the yellow crystalline colouring matter of quercitron bark.
1833Encycl. Brit. (ed. 7) VIII. 320/2 To this colouring matter Chevreul has given the name of quercitrin. Ibid. 321/1 Yellow crystals possessing the characters of quercitrin. 1841Penny Cycl. XIX. 211/1 The tannin which quercitrin contains..gives a green colour with peroxide of iron. 1845Ibid. Suppl. I. 349/2 On boiling a solution of quercitrin, it becomes turbid, and deposits a quantity of small acicular crystals of quercitrein. |
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