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Summary: The HP 57 ink cartridge is a tri-colored cartridge used for most HP printers. Refill each hole in an HP 57 cartridge with 5 milliliters of ink with help from an employee of an ink-filling station in this free video on HP printer cartridges.
"Hi this is Taylor and we're here talking about HP cartridges and specifically the HP 57 cartridge and how to refill it. The HP 57 cartridge is the tricolored cartridge for most HP printers. To fill it up simply remove the sticker placed by the manufacturer revealing the five holes. The top hole is for the magenta. This one over here is for the yellow and then the scion goes in these two slots over here. When refilling each one will take about 5 milliliters of ink. To do so simply insert the needle down into the cartridge. Be careful not to push down too far as you can enter the filter and cause problems. Once you fill each of them up on the sides, these ones, they go into the same reservoir so no need to fill each side."
eHow Article: How to Refill HP Ink Cartridge Number 57