Epson WorkForce 520 All-in-One Printer

When color ink is expended and black ink still remains, you may be able to continue printing for a short time on plain paper or envelopes using only black ink. However, you should replace the expended ink cartridge(s) as soon as possible

Note: This feature is not available for Mac OS X 10.4

You may also be able to continue copying from the control panel for a short time on plain paper using only black ink. If you see a message on your LCD screen telling you that you can temporarily copy and print in black and white, follow the instructions on the screen.