Xerography is the process used in most copying machines today. The page you want copied is exposed to the bright light in the machine. That light enables the machine to make an image of your original, using electrostatic charges to record the light and dark spots on your original. The toner – that fine black powder – is then drawn to those spots on the copier paper in exactly the same spots that were dark on your original. After the powder is fixed in place, your copy – perfect in every detail – pops out.
Source: Creation Moments
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