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leuco-base
leuco-base n. 
/ˌl(j)uːkə(ʊ)ˈbeɪs/, /ˌlukoʊˈbeɪs/
Brit. /ˈl(j)uːkə(ʊ)beɪs/
, /ˈl(j)uːkə(ʊ)beɪs//ˌl(j)uːkə(ʊ)ˈbeɪs/U.S. /ˈlukoʊˌbeɪs/
, /ˈlukoʊˌbeɪs//ˌlukoʊˈbeɪs/ΚΠ
1886 E. Knecht tr. R. Benedikt Chem. Coal-tar Colours 79 These compounds, called ‘leuco-bases’, are colourless and yield colourless salts with acids. By oxidation they are transformed..into the colour-bases, which differ from the ‘leuco-bases’ by containing one atom of oxygen.
1947 L. S. Pratt Chem. & Physics Org. Pigments viii. 140 The dyestuff is prepared by condensing o-chlorobenzaldehyde with dimethylaniline and then oxidizing the leuco base to the color base.
1958 J. R. Baker Princ. Biol. Microtechnique xvii. 309 Schiff's reagent..is often regarded as a leucobase, but this is an error; for a leucobase becomes coloured on oxidation and could not possibly serve in Feulgen's reaction.
1971 E. Gurr Synthetic Dyes 108 The leuco bases of triphenylmethane dyes (e.g. crystal violet and malachite green) are extremely light sensitive.
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