We put 4 original printer cartridge sets from Brother, Canon, Epson and HP up against 16 matching alternative sets. In the test: 4 cartridge sets for Brother printers, 8 for Canon, 4 for Epson and 4 for HP printers, preferably with XL content for the cheapest possible printing. You can find the exact names above in the "List of the 20 tested products"...