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I've left the cartridges set unopened on the shelf for over 1 year. I've had them installed in the printer for over a year...BUT... when the cartridges are in the printer I turn it on every 4-6 weeks, let it cycle, then turn it off. This helps keep the ink in the nozzles from drying and clears them. Yes it uses a bit of ink, but that's cheaper than head repair or replacement.
Sorry, there was a problem. Please try again later.Not sure about unopened, but just bought replacement after taking every bit out of the original ink that came with the printer purchased in 2015!!! Amazed that it would still print with whatever is left after 6 years.
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