Reactive leuco compounds and compositions comprising the same

A leuco composition comprising at least one reactive leuco compound, wherein the reactive leuco compound comprises a leuco moiety and at least one reactive moiety covalently bound to the leuco moiety, wherein the reactive moiety is sufficiently electrophilic to react with a nucleophilic moiety, wherein the ratio of the amount of the reactive leuco compound present in the leuco composition to the amount of a colored form of the reactive leuco compound present in the leuco composition is about 4:1 or more, wherein the leuco moiety is selected from the group consisting of diarylmethane leuco moieties, oxazine moieties, thiazine moieties, hydroquinone moieties, and arylaminophenol moieties, and wherein the reactive moiety is selected from the group consisting of sulfooxyethylsulfonyl moieties, halotriazinyl moieties, quaternary ammoniumtriazinyl moieties, halopyrimidinyl moieties, halopyridazinyl moieties, haloquinoxalinyl moieties, halophthalazinyl moieties, bromoacrylamidyl moieties, and benzothiazolyl moieties.