A leuco composition comprises at least one reactive leuco compound, which reactive leuco compound comprises a leuco moiety and at least one reactive moiety covalently bound to the leuco moiety. A laundry care composition comprises a laundry care ingredient and a leuco composition. A method of treating a textile comprises the steps of (i) treating a textile with an aqueous solution containing a leuco composition, (ii) optionally, rinsing the textile, and (iii) drying the textile.

A leuco polymer comprising a polyethylenimine and at least one leuco moiety covalently bound to the polyethylenimine, wherein the polyethylenimine comprises three or more amine nitrogen atoms and 1 mol. % or more of amine hydrogen atoms in the polyethylenimine are replaced with a moiety selected from the group consisting of 2-hydroxypropyl, 1-hydroxypropane-2-yl, and polyalkoxy groups. Methods of making the leuco polymer, laundry care compositions comprising the leuco polymer and methods of treating textiles with such laundry care compositions.

A photoelectric conversion element including a photoconductor layer, wherein the photoconductor layer contains semiconductor fine particles carrying a metal complex dye of Formula (I); a metal complex dye, a dye solution, a dye-adsorbed electrode, a dye-sensitized solar cell, and a method for producing the solar cell:
M(LD)(LA).Math.(CI) Formula (I) wherein M represents a metal ion; LD represents a tridentate ligand of formulas (DL-1) to (DL-4); LA represents a specific tridentate ligand; and CI represents a counter ion: ##STR00001## Y.sup.1 and Y.sup.2 represent an oxygen, sulfur, nitrogen, or phosphorus atom; AD and BD represent a hydrocarbon or hetero ring; L represents a linking group of formulas (L-1) to (L-4); and Ra and Rb represent a substituent, ##STR00002## X represents a nitrogen or carbon atom; CD represents hetero ring; T represents O, S, NR.sup.L2 or PR.sup.L3; R.sup.L1 to R.sup.L3 represent a hydrogen atom or a substituent; and Alk represents an alkylene group.