This October 2007 press release describes and illustrates how "hidden knowledge of the true colors [of this Leonardo da Vinci painting] was revealed by multispectrally scanning the painting in thirteen channels -- from Ultra Violet to Infra Red." This resulted in "the virtual removal of years of accumulated varnish." Also includes links to citations for recent studies and a presentation. In English and French. From Lumiere Technology, the company that scanned the painting.