HP Deskjet 3520 Inkjet Printer - Manual (Page 17)

maintaining print cartridges
The following tips will help maintain HP print cartridges and ensure consistent print
quality:
●
Keep all print cartridges in their sealed packages until they are needed. Print
cartridges should be stored at room temperatures (15-35 degrees C or 59-95
degrees F).
●
Do not remove the plastic tape covering the ink nozzles until you are ready to
install the print cartridge in the printer. If the plastic tape has been removed
from the print cartridge, do not attempt to reattach it. Reattaching the tape
damages the print cartridge.