A xerographic inage is made up 0L about 100 more ini:nediate practic .1 interest, they reveal in a million carefully arranged bits of pigmented plastic developer the presence of toner particles having toner particles. The 'whole xerographic process litrle or reversed=sign charge. Such toner is not controllable by devsloprnent electric fields or by the and its nlachiney are simply the means of arrang" electric fleids holding toner to carrier surfaces. ing toner particles into faithful patterns,

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... rans ferring the patterns to paper, and making them Thus it is a potential source of unwanted back= permanent by melting. When things are done ground development and machine dirt contaminaproperly, each tc'ner particle carries the electric tion.