MAGNETIC TONER HAVING IMPROVED HUMIDITY DEPENDENCY

摘要

A magnetic toner, having an improved humidity dependency and used for developing an electrostatically charged image, comprises as main ingredients a magnetic material composed of magnetite and a binder medium. The water-soluble component in the magnetite is lower than 0.15% by weight and the water content of the magnetite at a temperature of 20 DEG C and a relative humidity of 60% is lower than 0.3% by weight.