HP Color LaserJet 9500 Multifunction Printer series - Manual (Page 208)

http://www.hp.com/go/clj9500mfp
192 Chapter 8 – Managing and maintaining Rev. 1.0
Authentic HP print cartridges for the HP Color LaserJet 9500mfp have the following part numbers:
Print cartridge life is directly proportional to the coverage of toner on the page. Each color print cartridge prints
approximately 25,000 pages of letter-size or A4-size media at 5% toner coverage (a full page of text), 50,000 pages at 2.5%
coverage (a page partially covered with text), and 12,500 pages at 10% coverage (a page with text and graphics).
Hewlett-Packard Company recommends that you place an order for a replacement print cartridge when the ORDER <COLOR>
CARTRIDGE message first appears on the control-panel display.
Print cartridge Part number
Black C8550A
Cyan C8551A
Yellow C8552A
Magenta C8553A