A decolorizable toner allows for easy distinguishing between a sheet which can be reused and a sheet which is hardly able to be reused from each other. The decolorizable toner includes a color developable compound, a color developing agent, a decolorizing agent, a magnetic material, and a binder resin. The color developable compound is a precursor compound of a dye. The color developing agent is an electron accepting compound which donates a proton to the color developable compound. The decolorizing agent is a compound which inhibits a coloring reaction between the color developable compound and the color developing agent.

A decolorizable toner allows for easy distinguishing between a sheet which can be reused and a sheet which is hardly able to be reused from each other. The decolorizable toner includes a color developable compound, a color developing agent, a decolorizing agent, a magnetic material, and a binder resin. The color developable compound is a precursor compound of a dye. The color developing agent is an electron accepting compound which donates a proton to the color developable compound. The decolorizing agent is a compound which inhibits a coloring reaction between the color developable compound and the color developing agent.

Provided is a toner for electrophotography. The toner includes a toner particle including a binder resin, a colorant, and a releasing agent, and an additive attached to an external surface of the toner particle. The additive includes a quantum dot-inorganic particle composite including a quantum dot and an inorganic particle.

A toner has a toner particle including a binder resin, the binder resin includes a polymer A, the polymer A contains a first monomer unit derived from a first polymerizable monomer and a second monomer unit derived from a second polymerizable monomer, the first polymerizable monomer is selected from (meth)acrylic acid esters having an alkyl group having 18 to 36 carbon atoms, the content of the first monomer unit in the polymer A is 5.0 mol % to 60.0 mol %, the content of the second monomer unit in the polymer A is 20.0 mol % to 95.0 mol %, the SP value of the first monomer unit and the SP value of the second monomer unit satisfy a predetermined relationship, the polymer A includes a predetermined polyvalent metal, and the content of the polyvalent metal is 25 ppm to 500 ppm.

An electrostatic-image developing toner includes toner particles including a binder resin including an amorphous resin including a polyester resin segment and a styrene acrylate resin segment and a release agent. The content of 1-amino-2-methoxybenzene in the electrostatic-image developing toner is 200 ppm by mass or less.

A pale-color toner includes toner particles. The toner particles each include a toner mother particle and an external additive attached to a surface of the toner mother particle. The external additive includes specific external additive particles. The specific external additive particles have a number average primary particle diameter of at least 30 nm and no greater than 305 nm. The specific external additive particles include antimony-doped tin oxide particles. A ratio (M.sub.Sb/(M.sub.Sn+M.sub.Sb)) of a mass (M.sub.Sb) of an antimony atom to a total of the mass (M.sub.Sb) of the antimony atom and a mass (M.sub.Sn) of a tin atom in the antimony-doped tin oxide particles is at least 0.04 and no greater than 0.31.

A toner comprising a toner particle, wherein the toner particle comprises a toner core particle, and the toner core particle comprises a binder resin; the binder resin comprises a resin A; the resin A comprises a monomer unit M1 having a specific structure in a specific amount, and a monomer unit M2 comprising an organosilicon polymer segment in a specific amount; the organosilicon polymer segment has a T3 unit structure and a T2 unit structure; in a DD/MAS measurement of the resin A by solid-state .sup.29Si-NMR, a proportion of a peak area corresponding to a silicon atom with the T3 unit structure, and a proportion of a peak area corresponding to a silicon atom with the T2 unit structure satisfy a specific relationship; and the weight-average molecular weight Mw of a tetrahydrofuran-soluble fraction of the resin A lies within a specific range.

A charging member 2 that charges an image bearing member 1 has an electrically conductive support and an elastic layer in contact with the image bearing member 1. The elastic layer includes a semi-conductive rubber composition having a matrix-domain structure including a matrix and domains having electric conductivity. The matrix has a higher volume resistivity than the domain. The developer includes a toner having toner particles. The toner particles each have a surface layer including an organosilicon polymer. The organosilicon polymer has a structure represented by RSiO.sub.3/2 (R is a hydrocarbon group having at least 1 and not more than 6 carbon atoms). The adhesion ratio of the organosilicon polymer on the surface of the toner particle is 90% or more.

An electrophotographic image forming apparatus includes: an electrophotographic photoreceptor; a charger that charges a surface of the electrophotographic photoreceptor; an exposer that exposes the charged electrophotographic photoreceptor; a developer that supplies a toner to the electrophotographic photoreceptor on which an electrostatic latent image is formed; a transferer that transfers a toner image formed on the electrophotographic photoreceptor; and a cleaner that removes a residual toner remaining on a surface of the electrophotographic photoreceptor, wherein the electrophotographic photoreceptor includes an outermost layer, a surface of the outermost layer has a projection structure due to a ridge of the inorganic filler, the toner contains toner base particles and metal oxide particles as an external additive externally added to the toner base particles, 70% or more of the toner base particles are covered with the metal oxide particles as the external additive, and following formulas (1) to (3) are satisfied.

[00001]$\left[\mathrm{Numerical}.Math..Math.\mathrm{formula}.Math..Math.1\right]$$\begin{array}{cc}{R}_{2}2.Math.\sqrt{2.Math.R_1.Math.R_3-R_1^2}& \left(1\right)\\ 0<R_1<R_3& \left(2\right)\\ 0<R_{2}250& \left(3\right)\end{array}$

A liquid developer containing toner particles containing a resin binder containing a polyester-based resin and a colorant, a dispersant, and an insulating liquid, wherein the dispersant contains a dispersant X having an adsorbing group having a nitrogen-containing group represented by the formula (I): ##STR00001##
wherein each of R.sup.1, R.sup.2, and R.sup.3, which may be identical or different, is an alkylene group having 1 or more carbon atoms and 22 or less carbon atoms, an alkenylene group having 2 or more carbon atoms and 22 or less carbon atoms, an alkynylene group having 2 or more carbon atoms and 22 or less carbon atoms, or an arylene group having 6 or more carbon atoms and 22 or less carbon atoms, and a dispersing group having a hydrocarbon group having a number-average molecular weight of 500 or more, and wherein the dispersant X has a mass ratio of the adsorbing group to the dispersing group (adsorbing group/dispersing group) of 1/99 or more and 42/58 or less, and a proportion of the dispersing group having a hydrocarbon group having a number-average molecular weight of 500 or more in all the dispersing groups of 55% by mass or more. The liquid developer of the present invention is suitably used in development or the like of latent images formed in, for example, electrophotography, electrostatic recording method, electrostatic printing method or the like.