I have been refilling for 20 years I still have some syringes that are around 10 years old for using with my all in ones. When I bought my wife the Canon 9500 about 4 years ago when she went digital with her scrapbooking and calendar making I got new syringes for it. I have been through well over a gallon of ink and am on my fourth quart of Light Magenta as she favors browns and pinks. Still using the same set of syringes all that time. I rinse with water and air dry.
I use a kitty litter tray for refilling and always wear Latex gloves I purchased always full carts but due to the fact that they gave no low ink warning and ruined an expensive sheet of photo paper each time they ran out. I purchased a chip re-setter and Original empties on
Ebay and now fill 4 or five cartridges of the main colors each time I run low no stopping to refill just pop out and put in a full refill.
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Bill Lewis