Printer cartridge expiry dates
We have some old(ish)[2006/2007] HP ink cartridges that I found in a few printers in our storeroom which are still mostly over half full. I cleaned the tip and inserted them into other active printers which will accept them, to find the printer says they have "expired" and are unusable! Is there a way around this "expiry"? I have googled however haven't found a definitive answer to it, other than "change the cartridge chip", "change the computer clock" amongst others.
Aside from that, does anyone know if HP add a similar type of expiration to their toner cartridges? If we had a toner cartridge that probably won't be used until later this year (and not knowing how old it is already), would it also show this "expired" message?