Epson Stylus Pro 4000 Reference Manual page 266

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5. Make sure the replacement ink cartridge is the correct color,
and remove it from the package.
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Note:
❏ Shake the ink cartridge gently before installing it for best
results.
❏ There is a protection system against improper cartridge
insertion. If you cannot insert the ink cartridge smoothly, the
type of cartridge may be incorrect. Check the package and
product code.
266
Maintenance and Transportation
Warning:
If ink gets on your hands, wash them thoroughly with soap
and water. If ink gets into your eyes, flush them immediately
with water.
Caution:
Do not shake cartridges that have been installed previously.
Doing so may cause ink to leak out.