| http://www.w3.org/ns/prov#value | - In the magnetic mono-component developing scheme, the magnetic material may be used also as a colorant, without using a colorant such as carbon black. [0003] In the two-component developing scheme, carrier particles such as glass beads or iron powder are necessary, and a device for detecting a toner concentration to replenish a necessary amount of toner is necessary for maintaining a constant tone
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