Yellow developer

A non-magnetic yellow toner comprising:

• a binder resin having an acid value of 1 to 30 KOH mg/g;
• a colorant comprising a compound classified into C. I. pigment yellow 180;
• and
• a wax having an acid value of 0.5 to 30 KOH mg/g dispersed in the binder resin as wax particles,
• wherein the wax particles contained in the toner have a particle size distribution that wax particles with particle size equal to or more than 3 .mu.m occupy 3 number % or less, wax particles with particle size equal to or more than 2 .mu.m and less than 3 .mu.m occupy 12 number % or less, wax particles with particle size equal to or more than 1 .mu.m and less than 2 .mu.m occupy 5 to 30 number %, and wax particles with particle size less than 1 .mu.m occupy 55 to 95 number %.

A one-component development process comprising:

• a step of feeding a one-component developer including a non-magnetic yellow toner particle which contains a binder resin having an acid value of 1 to 30 KOH mg/g, a colorant being a compound classified into C. I. pigment yellow 180 and a wax having an acid value of 0.5 to 30 KOH mg/g, to a developer supporting member provided so that its surface is movable;
• a step of, with an arrangement that a developer regulating member is disposed in contact with the developer supporting member, conveying the developer by the developer supporting member so that the developer is brought into contact with the developer regulating member, thereby forming a thin layer of electrically charged developer on the developer supporting member;
• a step of conveying the electrically charged developer to an area where the developer supporting member and an electrostatic latent image supporting member are opposed to each other;
• and
• a step of developing an electrostatic latent image retained on the electrostatic latent image supporting member with the electrically charged developer.

A two-component development process comprising:

• a step of feeding a two-component developer including a non-magnetic yellow toner particle and a magnetic carrier particle, the non-magnetic yellow toner particle containing a binder resin having an acid value of 1 to 30 KOH mg/g, a colorant being a compound classified into C. I. pigment yellow 180 and a wax having an acid value of 0.5 to 30 KOH mg/g, to a developer transporting member having an internally fixedly disposed magnet member and provided so that its surface is movable;
• a step of regulating amount of the developer on the developer transporting member to 0.7 to 10 mg/cm.sup.2 ;
• a step of conveying the developer by the developer transporting member to an area where the developer transporting member and an electrostatic latent image supporting member are opposed to each other;
• and
• a step of developing an electrostatic latent image retained on the electrostatic latent image supporting member with the developer under an oscillatory electric field.