Not sure if it is due to the amount of ink in these cartridges or in my printer but the ink comes out of the cartridges very quickly although I never print something else for black and white copies. Even the black ink disappears too quickly. I print less than 5 pages a month and most of those are a lot less than full pages. The reds, blues and yellows are never used, but the ink runs out about every 3-4 months. I think it's redundant.
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