| http://www.w3.org/ns/prov#value | - r of second color stored in a noncontact type second developing unit to thereby produce a toner image of second color, and transferring the first and second toner images to a recording medium, the toner of second color is deposited on a developer carrier of the second developing unit in a layer satisfying a relation: ##EQU1## where dt is a thickness of the layer, and ??t is an average volume speci
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