Printers / Toners & Supplies by office-supplies.us.com - Laser Printer Toner Laser printer toner is essential for creating documents that look both professional and clean. The actual product itself is a black powder that attaches itself to the paper through electrical charges. Since it is positively charged, it only attaches to the portions of the paper that has a negative charge. Next, it then passes through a fuser, which melts the powder onto the paper, producing an end result that is very precise each and every time.