Staples accepts all used ink and toner cartridges for recycling. The iGen3 and Nexpress use toner particles and the Indigo uses liquid ink. Color laser printers use colored toner (dry ink), typically cyan, magenta, yellow, and black (CMYK). The machine-readable lower portion of a cheque must be printed using MICR toner or ink. Other companies use the toner to provide a toner refill service. Chocolate, toner, paint or ink on fingers will result in patent fingerprints. For proper bonding of the toner, the fuser roller must be uniformly hot. Xerography is standard copy machine technology using toner on bond paper. The remanufacturing process, and the quality of the toner, differs between remanufacturers. This process results in toner granules with varying sizes and aspherical shapes. This results in more uniform size and shapes of toner particles. One of the company's most popular products was Eudermine, a scented skin toner. Similar HEPA-filter equipped vacuums should be used for clean-up of larger toner spills. Several toner manufacturers offer toner in wholesale quantities. Recycling of pre-consumer waste toner is practiced by most manufacturers.