Leuco colorants with extended conjugation

A composition comprising:

• (a) a solvent selected from the group consisting of water, primary alcohols, secondary alcohols, polyols, and mixtures thereof;
• and (b) a compound of Formula (XL)
• wherein G is independently selected from the group consisting of hydrogen, deuterium, C1-C16 alkoxide, phenoxide, bisphenoxide, nitrite, nitrile, alkyl amine, imidazole, arylamine, polyalkylene oxide, halides, alkylsulfide, aryl sulfide, and phosphine oxide;
• wherein R51, R52, and R53 are independently selected from the group consisting of aryl groups, substituted aryl groups, heteroaryl groups, and substituted heteroaryl groups;
• wherein a, b, and c are independently selected from 0 and 1, and the sum of a, b, and c is from 1 to 3;
• wherein each L is an independently selected divalent organic moiety, the divalent organic moiety comprising a divalent hydrocarbon backbone singly bonded to a central carbon atom (C′) and to one of R51, R52, or R53;
• the divalent hydrocarbon backbone containing 2n carbon atoms and n carbon-carbon multiple bonds, where n is any positive integer;
• and the carbon-carbon multiple bonds of the divalent hydrocarbon backbone are conjugated with one of R51, R52, or R53.