Yeah selenium is fun, it's used in photocopiers - the drum which the image is copied over is made of it. The drum is charged, then the light projected onto it caused the selenium to conduct, allowing the charge on those areas to leak away. Then toner particles are allowed to stick to the charged areas, and printed on to paper.
Well, that's how they used to work. They are all multi function now so use a CCD scanner and printer combination.
Yeah selenium is fun, it's used in photocopiers - the drum which the image is copied over is made of it. The drum is charged, then the light projected onto it caused the selenium to conduct, allowing the charge on those areas to leak away. Then toner particles are allowed to stick to the charged areas, and printed on to paper.
Well, that's how they used to work. They are all multi function now so use a CCD scanner and printer combination.