I just found this on line but haven't tried it.
Storing Opened Ink Cartridges
If your ink cartridges are already outside their original packaging, they should be placed in a plastic tub with an airtight lid for safekeeping. Along with the cartridges, place a damp cloth or paper in the sealed tub to initiate humid conditions in a controlled environment.
Remember, if cartridge nozzles are not stored in airtight and humidified conditions they can crust over or dry out, nullifying their usefulness. Make sure that there is nothing touching or leaning against the cartridge nozzles. If anything rubs against them, it can cause the ink to wick.
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