Epson Stylus Pro 7500 Startup Manual page 12

For best results, shake the ink cartridge gently before
installing it.
c
Caution
Do not shake cartridges that have been installed previously.
Once you install an ink cartridge, do not remove the cartridge
except to replace it with a new one. The printer may not
determine the correct level of ink remaining.
Do not use an ink cartridge beyond the date printed on the
cartridge carton.
For best results, use up the ink cartridges within six months
of installation.
Do not dismantle the ink cartridges or try to refill them. This
could damage the print heads.
4
Safety Instructions