indigo-whiten.
Chemistry.
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 n.); but now known to be formed from the natural glucoside, indican n., by the agency of a special bacillus.
ΘΚΠ
the world > matter > chemistry > organic chemistry > organic dyes > [noun] > indican derivatives
indigogen1838
indigo-red1838
indifuscin1859
indirubin1859
indicanine1865
indifulvin1865
indiglucin1865
indihumin1865
indiretin1865
indigo-white1874
1850 C. G. B. Daubeny Introd. Atomic Theory (ed. 2) viii. 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.]
1874 C. Schorlemmer Man. Chem. Carbon Compounds 426 Hydro-indigotin or Indigo-white stands in the same relation to indigotin as hydrazobenzene to azobenzene... Indigo-white is a crystalline white powder.
1875 R. Hunt & F. W. Rudler Ure's Dict. Arts (ed. 7) 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.
This entry has not yet been fully updated (first published 1900; most recently modified version published online September 2019).
<
n.1874