Halo-organic heterocyclic compounds are described, in which at least two halogen atoms are bound to a nitrogen-containing heterocyclic terminal moiety of the compound, with at least one of such halogen atoms being iodine or bromine. Also described are polymethine dyes based on these heterocyclic compounds, and dendrimeric compounds and conjugates of such polymethine dyes. The polymethine dyes are characterized by enhanced properties, e.g., brightness, photostability, sensitivity and/or selective affinity that make them useful to target cancer cells, pathogenic microorganisms, and/or other biological materials, in applications such as photodynamic therapy, photodynamic antimicrobial chemotherapy (PACT), cancer treatment, selective removal or attachment of biological materials, antimicrobial coating materials, and other diagnostic, theranostic, spectrum shifting, deposition/growth, and analytic applications.

A dye mixture, comprising at least one blue dyeing dye of the formula (1), wherein Q.sub.1 represents a bivalent radical of formula (4a), (4b) or (4c), wherein X.sub.1 denotes chlorine or fluorine, R.sub.1 is hydrogen or C.sub.1-C.sub.8 alkyl, R.sub.2 is hydrogen, C.sub.1-C.sub.8alkyl, C.sub.1-C.sub.4alkoxy or sulfo, Y.sub.1 is vinyl or a radical CH.sub.2CH.sub.2U and U is a leaving group removable under alkaline conditions, R.sub.3 is hydrogen or C.sub.1-C.sub.8alkyl that is unsubstituted or substituted by hydroxy, sulfo, sulfato, cyano, carboxy, C.sub.1-C.sub.4alkoxy or phenyl, r and s are each independently of the other the number 0 or 1, and t is the number 0, 1 or 2, and the sum of r, s and t is 2 or 3 and at least one yellow or red dyeing reactive dye is suitable especially for the dichromatic or trichromatic dyeing or printing of natural or synthetic polyamide fibre materials and yield dyeings or prints having good reproducibility and good all-round fastness properties. ##STR00001##

Dye mixtures based on dye(s) of formula (1) ##STR00001##
and dye(s) of formula (2) ##STR00002##
formula (3) ##STR00003##
formula (4) ##STR00004##
formula (5a) ##STR00005##
and/or formula (5b) ##STR00006##

According to an embodiment of the present disclosure, the present disclosure provides a dye with excellent light resistance that is not deformed by external sunlight and excellent chemical resistance that does not change color by other solvents during the process even when molded at low temperatures, a photosensitive resin composition to which such dye is applied, and a display device to which the same is applied.

According to an embodiment of the present disclosure, the present disclosure provides a dye with excellent light resistance that is not deformed by external sunlight and excellent chemical resistance that does not change color by other solvents during the process even when molded at low temperatures, a photosensitive resin composition to which such dye is applied, and a display device to which the same is applied.