| 单词 | indigo-sulphonic acids |
| 释义 | > as lemmasindigo-sulphonic acids indigo-sulphonic acids n. (popularly indigo-sulphuric acids) i.e. indigo monosulphonic and indigo disulphonic acids, products of the action of sulphuric acid on indigo-blue. Π 1881 H. Watts Dict. Chem. 3rd Supp. 1088 A peculiar modification of commercial indigosulphonic acid (commonly called indigosulphuric acid). 1889 H. F. Morley & M. M. P. Muir Watts' Dict. Chem. (rev. ed.) II. 758/1 Indigo-mono-sulphonic acid, C16H9N2O2(SO3H), Phœnicine sulphuric acid: a blue powder formed by allowing to stand some time a mixture of indigo with ordinary sulphuric acid. 1889 H. F. Morley & M. M. P. Muir Watts' Dict. Chem. (rev. ed.) II. 758/1 Indigo-di-sulphonic acid, C16H8N2O2(SO3H)2, Sulphindigotic acid, Cæruline-sulphuric-acid, Indigo-extract. < as lemmas |
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