70 Percent of Color Laser Printer Installed Base Use Chemical Toner In North America. the installed base of color laser printers that use chemical toner has grown from about 5 percent of the total installed base in 1999 to about 70 percent of the total installed base of color lasers in 2005. A timeline of product introductions helps to explain this explosive growth. HP introduced the first color laser using chemical toner in 1998. Three years later, Xerox introduced its emulsion aggregate (EA) toner, a chemical toner for color lasers. The following year, Konica Minolta introduced color lasers that use chemical toner. By 2003, HP was already on its second generation of color laser printers that use chemical toner. Both Xerox and Konica Minolta have huge patent portfolios surrounding the production of chemical toners, making it more difficult for the aftermarket to compete.