[kiryin]

I've read about this so much, I wonder if B/W printers have anything similar? Is there a secret yellow cartridge somewhere in my printer that I don't know about?

[oldsecondhand]

This is for color printing only to track potential money counterfeiters.

[cromulent]

Modern printers refuse to print/copy money anyway, right? At least ours did when we went to print some money for a themed Christmas party.