Quote:
Originally Posted by Quoth
Most CFLs and fluorescent tube lamps have a peak greenish hue and will make eink look greenish/grey compared to printer/copier paper which will mysteriously still be white. So don't use copier/printer paper to set electronic camera white balance.
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Copier/printer paper, as well as many other types of paper, is made with OBAs (Optical Brightening Agents) that fluoresce when exposed to UV light. It's similar to the stuff used in laundry detergents to give "whiter whites". A small amount of UV output is found in most non-incandescent lighting sources as well as sunlight.