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[Silverstrand]

Says the PCworld article; "The dots' minuscule size, covering less than one-thousandth of the page, along with their color combination of yellow on white, makes them invisible to the naked eye, Crean says. One way to determine if your color laser is applying this tracking process is to shine a blue LED light--say, from a keychain laser flashlight--on your page and use a magnifier."
Link: http://www.pcstats.com/NewsView.cfm?NewsID=44157