indigotin Chem.
(ˈɪndɪgəʊtɪn)
[f. indigo + t euphonic (cf. agiotage) + -in.]
= indigo-blue.
| 1838 Penny Cycl. XII. 460/1 When common indigo has been treated with dilute acids, alkalis, and alcohol, the remainder is indigo-blue, or indigotin, or indigo nearly in a state of purity. 1874 Schorlemmer Org. Chem. 425 Indigotin or indigo-blue, C16H10N2O2. |
b. attrib. and Comb., as indigotin-disulphonic = indigo disulphonic; indigotin-disulphonate = sulphindigotate: see indigo-carmine (indigo C. 2).
| 1874 Schorlemmer Org. Chem. 427 The filtrate from this acid contains indigotindisulphonic acid (indigo-sulphuric acid), C16H8N2O2(SO3H)2.—[See quot. for indigo-extract s.v. indigo C. 2.] |