Good idea to attach a high capacity cartridge for black and medium for colors, it's smart! However my rates are still prohibitive, fortunately they are slightly cheaper on Amazon than in the trade ... But you have to be strategic in the use of its cartridges knowing the mode of operation of Epson inks: an integrated chip delimits the cartridge between the remaining and Counting not only when you use it but every time you turn on the printer, that is why you always have a quantity of ink more or less important when you Epson blocks the print for "empty cartridge". Namely also that many new Epson printers are designed to not recognize the cartridges "compatible", and if a color cartridge is empty you can not use the other, not even the black (even in monochrome printing). But hey, the grass is not always greener on the other and therefore thank you to Amazon to lower prices on some of these consumables the scam, that makes the medicine go down ... just a little ...