Carrier, two-component developer, supplemental developer, image forming method, process cartridge and image forming apparatus

A carrier comprising:

• magnetic core particles;
• and
• a coating layer on a surface of each of the magnetic core particles,
• wherein the coating layer comprises electroconductive particles,
• wherein the electroconductive particles are electroconductive particles in which a white inorganic pigment is coated with phosphorus-doped tin or tungsten-doped tin,
• wherein a dope ratio of phosphorus or tungsten to tin in the phosphorus-doped tin or the tungsten-doped tin is 0.010 to 0.100, and
• wherein a particle diameter of the white inorganic pigment in the electroconductive particles R1 (μm) and a particle diameter of the electroconductive particles R2 (μm) satisfy the following expression:
• 1.4≦R2/R1≦2.6.