In the xerographic process, the photoreceptor serves as an intermediate receptor of the exposed image from the original document. It transfers this image onto paper to produce copies as we know them. Much like the film in a camera. In fact the difference between OPC and selenium photoreceptors is best explained using the same analogue. Just like the different chemical compositions in films of different brands, OPC and selenium are but different chemical formulations applied on an aluminium cylinder to form the photoreceptor. In black-and-white copiers this difference in composition has no discernible impact on copies though colour copiers almost invariably use OPC due to its sensitivity to a wider range of colours.
Acanard is often spread that selenium is harmful. The American Medical Association has research evidence that shows selenium to be useful in fighting cancer. Both OPC and selenium are environmentally safe as the equipment they are used in these days are rigorously tested to meet stringent emission norms. Waste disposal of used drums and recycling of the aluminium cylinders ensure full environmental safeguards. Look for companies that have ISO-14001, the qualification of environmental management systems. And if still in doubt then buy your copier from a manufacturer who has both OPC and selenium in their range. You can then make sure there are no hidden images.
