When it comes to replacing printer cartridges it can work out expensive with many costing nearly twenty, or even thirty pounds! When my own canon mp250 colour cartridge ran empty i decided to give jr's universal ink refill kit a go. It includes instructions for many makes of printers which are quite idiot proof! There are a few things i would recommend like wearing latex gloves or similar, also do this on a flat surface like the kitchen table as you will need to be near the cold tap as the syringe will need flushing out after doing every colour, use cotton buds and tissue paper to dry the syringe out, do this on an old tea towel though there shouldn't be any mess if you take your time, have tissuses handy just in case. Make sure the needle of the syringe penetrates the centre of the sponge to get the ink into the cartridge. If this is your first time just do a bit of ink at a time and slowly, leave the cartridges on an old saucer over night in case they leak but they shoudn't. Many printers may require a reset as the newly filled cartridge may not be recognised, for example just google mp250 reset and there should be a solution. I have read that a cartridge can be refilled six, nine maybe more times before it gives out! This kit comes recommended as it pays for itself after the first refill, all in all a good buy that could save you £100 or more on each cartridge!