| http://www.w3.org/ns/prov#value | - is in contact with the convey belt, wherein the method has a color mode in which a color image is formed by using four color toners including yellow, magenta, cyan, and black, and a monochromatic mode in which a monochromatic image is formed by using black toner, and in the monochromatic mode, a first bias for transferring the toner image is applied to the transfer unit while the transfer image i
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