Question about Lexmark X7170 All-In-One InkJet Printer
These models use a "3 colour" printing process. In other words, these printers do not contain black ink when the BC-05 colour cartridge is installed. To produce black print, a 3 colour printer mixes an equal amount of the three primary colours. This process is known as "composite" black.
As the ink in the cartridge runs out, one of the three primary colours will run out first, depending on the material that has been printed. After one of the three colours has depleted, this colour will be missing from the mixture required to print black, and the print will change colour. This is the indication that the cartridge needs to be replaced. Usually the remaining colours in the cartridge will run out soon afterwards.
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Posted on Feb 07, 2009
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