A developer comprises: at least one carrier; and, in an amount of 10 wt-% or less, a coating material (237), in particular for generating a coating layer by non-impact printing, the coating material being provided in the form of particles and comprising: a curable resin preferably an at least partially thermal curable resin and even more in particular curable by a crosslinking agent able to react with functional groups of the resin, the resin comprising in particular an amorphous resin portion; wherein an average diameter of the particles is in a range between 1 m and 25 m; and wherein the particles have an average sphericity larger than 0.7, in particular larger than 0.8, in particular a sphericity larger than 0.9; wherein, if the coating material is heated from room temperature with a heating rate of 5 K per minute, the coating material upon heating reduces its viscosity down to a minimum viscosity and increases its viscosity upon further increase of the temperature; wherein the minimum viscosity is in a range between 3 Pascal seconds and 20000 Pascal seconds.

Provided are toners and combinations of toners that demonstrate excellent color and are Ames test negative in both Salmonellatyphimurium strains TA98 and TAIOO.

A toner having a toner particle having a plurality of fine particles on the surface of a toner base particle, the toner base particle contains a binder resin, wherein a fine particle layer A constituted of a plurality of the fine particles is observed in an EDX mapping image of the constituent elements in a cross section of the toner particle as provided by EDX of the toner particle cross section observed using TEM; a fine particle B, containing a metal compound containing at least one metal element M selected from all the metal elements belonging to Groups 3 to 13, is observed in the fine particle layer A; and the number-average particle diameter D of the fine particle B, the average value H of the thickness of the fine particle layer A, and the standard deviation S on the thickness of the fine particle layer A satisfy prescribed relationships.

A toner comprising a toner particle having a binder resin, a wax and a colorant, and metal titanate fine particles having a perovskite crystal structure, wherein in cross section observation of the toner using a transmission electron microscope, when a proportion of an area occupied by the wax in a surface layer region from the surface of the toner particle to a depth of 1.0 m is denoted by As, the As is from 5.0% to 30.0%, and a number average particle diameter of primary particles of the metal titanate fine particles is from 10 nm to 80 nm.

A toner has a toner particle that has a binder resin and a release agent, wherein when the temperature when G=1.010.sup.5 Pa in a dynamic viscoelastic measurement on the toner is denoted by Ta, and the glass transition temperature in a differential scanning calorimetric measurement on the toner is denoted by Tg, the Ta and the Tg satisfy the following formulas:

40 C.Tg70 C.,

60 C.Ta90 C., and

0 C.TaTg35 C.; and the toner has a storage elastic modulus G having a minimum value in the range from 110 C. to 150 C. in a dynamic viscoelastic measurement on the toner.

Provided is an image forming method using an electrostatic image developing toner containing: toner mother particles including a binder resin; and an external additive, wherein the binder resin contains a vinyl resin in an amount of 40 mass % or more with respect to the total amount of the binder resin, the image forming method including a step of: forming an image so that an image surface resistance value at 70 C. by a temperature change method of the formed image is set to be 510.sup.13 or less.

A positively chargeable 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 toner mother particle includes a polyester resin having an acid value of at least 10.0 mgKOH/g, a compound having a quaternary ammonium cation group, and strontium titanate particles. The external additive includes no strontium titanate particles.

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 toner having chargeability and fluidity that do not change to a great extent is provided. The toner includes toner particles containing a binder resin and includes inorganic fine particles A, wherein the shape factor SF-2 of primary particles of the inorganic fine particles A is 116 or less, and regarding the particle size distribution on a volume basis of the inorganic fine particles A on the toner particle surfaces, the particle diameter when a cumulative value from the small particle side reaches 16% by volume is denoted as D16, the particle diameter when a cumulative value reaches 50% by volume is denoted as D50, and the particle diameter when a cumulative value reaches 84% by volume is denoted as D84, D50 is 80 nm or more and 200 nm or less, and the particle size distribution indicator A represented by D84/D16 is 1.70 or more and 2.60 or less.

Provided is an electrostatic latent image developing toner including toner mother particles having an external additive on a surface of the toner mother particles, wherein the external additive contains inorganic particles and aliphatic acid metal salt particles; the inorganic particles have a number average particle diameter in the range of 10 to 50 nm, and have a Mohs hardness of 8 or more; and the aliphatic acid metal salt particles have a number average particle diameter in the range of 0.4 to 2.0 m.