| 释义 |
indigo-white Chem.
Reduced or deoxidized indigo, C16H12N2O2, also called leucindigo, a white crystalline powder produced by subjecting commercial indigo to the action of a reducing agent, as an alkaline fluid; it is re-converted by oxidation to indigo-blue.
Formerly supposed to exist ready-formed in indigoferous plants (see quot. 1850), (whence the former name indigogen); but now known to be formed from the natural glucoside, indican, by the agency of a special bacillus.
[1850Daubeny Atom. Th. viii. (ed. 2) 237 Indigo is extracted from a variety of plants, in which it exists in a colourless form, constituting what is called white indigo, which becomes blue on exposure to light and air.] 1874Schorlemmer Org. Chem. 426 Hydro-indigotin or Indigo-white stands in the same relation to indigotin as hydrazobenzene to azobenzene... Indigo-white is a crystalline white powder. 1875Ure's Dict. Arts II. 907 When an excess of some acid is added to the yellow solution, the indigo-white is precipitated in white or greyish-white flocks. |