Xerox is currently researching reusable paper, according to CTO Sophie Vandebroek, who discussed the project yesterday at the Emerging Technologies Conference. Printouts made on the paper would fade in a specified period of time, allowing the paper to be reused. Vandebroek compares it to lenses that take on a darker tint in the sun and then fade once they’re removed from sunlight. The technology is still very much in the research phase, but she ultimately expects the paper to be especially useful in the corporate world, where she says that 40 percent of printed documents are discarded a short time after they are printed.