A subtle background pattern generated by color laser printers helps authorities track counterfeit money or other documents back to the printer--and to the person who pressed the Print button.

I have an HP970 printer that stopped printing any yellow color. I figured it just ran out of ink and so I replaced the color cartridge. However, it still isn't printing any yellow.

HEIDELBERG, Germany — November 14, 2016 — Heidelberger Druckmaschinen AG (Heidelberg) is now offering an optional new neon yellow spot color for its Versafire CV digital printing system.