| http://www.w3.org/ns/prov#value | - t optical image derived from said original image pattern and of said desired color, and then subjecting said insulative layer to further charging with either a D.C. discharge of opposite polarity to said one polarity or with an A.C. discharge while exposing said photoconductive layer to a second optical image derived from said original image pattern and of the colors in said original except said d
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