> as lemmas

1888 Jrnl. Chem. Soc. 54 493 The anthraquinone-dyes yield leuco~compounds on reduction.

1906 Notices Proc. Royal Inst. Great Brit. 17 107 What we are pleased to call leucocompounds, are in the majority of cases by no means colourless. Indigo-white itself is not white but yellow in its alkaline solution which we call a vat. Other vat-dyes have leucocompounds which are even more strongly coloured.

1961 S. R. Cockett & K. A. Hilton Dyeing of Cellulosic Fibres viii. 280 All methods used in practice to apply vat dyes to cellulosic fibres involve, at some stage, the conversion of the insoluble vat dye to the soluble sodium salt of the so-called leuco compound of the dye.