Expiration date on pigment inks — Why?

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Alexey Senior Member • Posts: 1,092
Expiration date on pigment inks — Why?

Most people using expired pigment inks report that they are fine even more than 10 years after the expiration date.  Why is there an expiration date then?
I get it that some pigment may settle.  But wouldn’t vigorous shaking bring it back to life?  Is there anything else that can go wrong with ink in say 10-20 years?   Has anyone ever used expired ink and had issues because of it?  Are there color shifts in ink after the expiration?

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