A compound excellent in chroma, light resistance and solubility. The compound has a structure represented by Formula (1).

##STR00001## wherein R.sub.1 and R.sub.2 each independently represent a linear or branched alkyl group having 1 to 12 carbon atoms, R.sub.3 represents a linear or branched alkyl group having 1 to 4 carbon atoms, an aryl group having a substituent, or an unsubstituted aryl group, and R.sub.4 represents an alkyl group having 1 to 4 carbon atoms; and R.sub.5 and R.sub.6 each independently represent a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms, an alkyl group having a hydroxyl group at the terminal, an aryl group having a substituent, or an unsubstituted aryl group; and R.sub.5 and R.sub.6 may be combined to form a heterocycle.

Provided is a compound that is fluidized by light irradiation and reversibly non-fluidized, is not significantly colored, and improves fixability and exhibits excellent image stability and color reproducibility when used for a toner. Provided is a compound represented by the following general formula (1), which is fluidized by light irradiation and reversibly non-fluidized: ##STR00001## wherein Z.sub.1 and Z.sub.2 are CH or N, and Z.sub.1?Z.sub.2; R.sub.1 is an aromatic hydrocarbon group having a substituent R.sub.a selected from the group consisting of an alkyl group, an alkoxy group and a halogen atom at each of two ortho positions with respect to Z.sub.1; and R.sub.2 is a substituted or unsubstituted aromatic heterocyclic group.

A method for producing a halogenated organic pigment comprising a halogenation step of halogenating an organic pigment with a halogenating agent, wherein the halogenating agent comprises one or more N-haloimide compounds selected from the group consisting of trichloroisocyanuric acid, a metal salt of dichloroisocyanuric acid, tribromoisocyanuric acid, and a metal salt of dibromoisocyanuric acid. According to the present invention, a method for producing a halogenated organic pigment which does not use high toxic raw materials, does not generate a large amount of unfavorable by-products such as hydrogen halide gas and succinimide, and is excellent in terms of safety and productivity can be provided.

Provided are a quinacridone pigment having a low content of a primary aromatic amine, a method for producing the same, and also a gravure and flexo ink, a colorant for plastic, a paint, a lithographic ink, a toner, or an ink-jet ink using the pigment. The quinacridone pigment having a low primary aromatic amine content is provided by washing a quinacridone pigment with at least one solvent selected from water and an organic solvent, or by adding an oxidizing agent to a pigment slurry including a quinacridone pigment and at least one solvent selected from water and an organic solvent to oxidatively decompose the aromatic amine.

This invention aims at providing a compound capable of providing a toner having high covering power and a toner having high covering power, which is achieved by an azamethine acetyl amide-based compound having a specific structure.

This invention aims at providing a compound capable of providing a toner having high covering power and a toner having high covering power, which is achieved by an azamethine acetyl amide-based compound having a specific structure.

A green toner for electrostatic charge image development includes green toner particles containing a binder resin, an azomethine fluorescent pigment having an emission peak in a wavelength region of 500 nm or more and 550 nm or less in an emission spectrum, and a non-fluorescent pigment having a reflection peak in a wavelength region of 480 nm or more and 540 nm or less in a reflection spectrum. A mass proportion of the azomethine fluorescent pigment in the green toner particles is 3% by mass or more and 20% by mass or less; and silica particles externally added to the green toner particles. The silica particles have an average primary particle size of 50 nm or more and 350 nm or less.

A compound that is fluidized by light irradiation and reversibly non-fluidized and is represented by the following general formula (1): ##STR00001## In the general formula (1), Ar.sub.1 and Ar.sub.2 each independently represent an aromatic hydrocarbon group optionally having a substituent or an aromatic heterocyclic group optionally having a substituent, and Y, Z.sub.1, and Z.sub.2 each independently represent a hydrogen atom or a lower alkyl group.

An electrostatic charge image developing toner set contains a fluorescent toner that contains a fluorescent colorant and has a brightness of 75 or more and a non-fluorescent toner that contains no fluorescent colorant, in which an amount of NH.sub.4.sup.+ on a surface of the fluorescent toner, that is measured by an ion chromatography method, is 0.05 mg/L or more and 0.30 mg/L or less, and a difference between the amount of NH.sub.4.sup.+ on the surface of the fluorescent toner and an amount of NH.sub.4.sup.+ on a surface of the non-fluorescent toner, that are measured by an ion chromatography method, is 0.12 mg/L or more, where, the amount of NH.sub.4.sup.+ is an amount of NH.sub.4.sup.+ detected by a method in which 0.5 g of the fluorescent toner or the non-fluorescent toner is weighed, and then added to 100 g of deionized water at 30 C.1 C., the mixture is dispersed by ultrasonic waves for 30 minutes, and then filtered through a filter, and the filtrate is analyzed by an ion chromatography method.