Static electricity and solder balls in a plastic bottle
photocopier use drum with static fully charged. Then light reflect from paper which collect text or picture pattern has focus to drum. The drum coated change it’s electrical resistance and allow static on lighted area flow to ground, no static on white surface of drum. Later, drum exposed to ink dust. Ink dust depositing to charged remaining area, forming text or picture pattern on drum. Another process you can imagine.... Yes, drum transfer that ink to paper. Last process is heat up ink to ...
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