Each cartridge has poor ink distribution on the page. For example, two or three lines or more per page will be darkened instead of being completely filled with ink. This will progress intermittently, starting with a few lines that are lightly applied from time to time and ending with a few lines that appear more frequently as the ink cartridge is used. If this happened to a single ink cartridge I probably wouldn't waste time giving a bad review, but it has happened to multiple cartridges.
Cool Toner 055H Compatible Toner Cartridge Replacement for Canon: High-Quality Ink for Your Printer (Black Cyan Magenta Yellow, with Chip, 4-Pack)
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