Magnetic one-component toner

Magnetic one-component toner comprising a toner particle having:

• a toner base particle containing at least a binder resin and a magnetic powder;
• and
• an external additive attached to a surface of the toner base particle,
• wherein
• the external additive contains:
• first silica particles with positive chargeability with respect to non-coated ferrite carrier;
• and
• second silica particles with negative chargeability with respect to the non-coated ferrite carrier, and
• when 10 g of the non-coated ferrite carrier and 0.1 g of the silica particles are weighed in a plastic bottle of 10 mL and mixed using a Turbula Shaker-Mixer to determine a charge amount after mixing for one minute as an initial charge amount, and a charge amount after mixing for 10 minutes as an after-mixing charge amount,
• a ratio of an absolute value of the initial charge amount of the second silica particles to an absolute value of the initial charge amount of the first silica particles is 10% to 50%, and
• a falling rate of the after-mixing charge amount to the initial charge amount of the first silica particles and a rising rate of the after-mixing charge amount to the initial charge amount of the second silica particles are both 20% to 50%.