| 释义 |
indigo-blue, n. and a.
A. n.
1. The blue-violet colour of indigo.
1712E. Cooke Voy. S. Sea 329 The Back of an Indigo Blew. 1796Kirwan Elem. Min. (ed. 2) I. 27 [Colours] Indigo blue—the deepest, nearly black. 1860Tyndall Glac. i. xxvii. 196 They appeared of a decided indigo-blue. 1879O. N. Rood Chromatics viii. 93 The original white colour passed rapidly through a greenish blue into a beautiful indigo-blue.
2. The blue colouring matter of indigo, also called indigotin, C16H10N2O2, crystallizing in fine right rhombic prisms of blue colour and metallic lustre; pure indigo.
1838T. Thomson Chem. Org. Bodies 198 The sublimed sulphite becomes blue when dissolved in water, probably in consequence of a little indigo blue having been carried over. 1865–72Watts Dict. Chem. III. 250 Schunck has further shown that woad contains indican..which..when boiled with acids splits up into indigo-blue and indiglucin, without the intervention of oxygen. 1875Ure's Dict. Arts II. 907 The value of indigo depends entirely on the quantity of indigo-blue which it contains.
B. adj. Of the blue colour of indigo.
1836Macgillivray tr. Humboldt's Trav. xxii. 309 The surface of the bay was of an indigo-blue or violet tint. 1846G. E. Day tr. Simon's Anim. Chem. II. 178 Urine containing an excess of this colouring matter..deposits a brownish, blackish, or frequently an indigo-blue sediment. |