Did you know that most manufacturers use a similar technique for printer ink cartridges? Canon, HP and Lexmark all use thermal ink jet technique, while Epson doesn’t. Thermal cartridges have an ink reservoir inside and a small heating element that has a piece of metal on it. Printer controls the printing buy letting small current through the metal piece that than evaporates the int and makes it liquid. Hot ink is than pushed out in tiny bubbles from a nozzle onto the paper. This all happens very fast, that’s why printers print the pages out so fast. It’s a good idea to buy original ink for your printer, to keep the quality of printing and printing head in good condition. So if you have a HP printer your need to buy HP ink.
Epson ink printers use a bit different technique called piezoelectric technique. It tends to be more economical with ink and can handle a wider variety of inks.