We use the most widely accepted chemical analysis technique known as gas chromatography/mass spectrometry (GC/MS) to help determine if a written entry was created in the past two years. This has become a popular post so I'm copying over the answer from the official HP forums rather than linking to it.In the second quarter of 1938 this system was however changed to save production time, and a new date code, using a system of dots, was adopted. The stamp initially had three dots and for each quarter one dot was filed down leaving none for the fourth quarter. ⚠ CAUTION: While ink cartridges are not damaged when left outside of the printer, the printhead does need to have all cartridges installed at all times after the printer is set up and in use.Leaving one or more cartridge slots empty for an extended period may lead to print quality problems and possibly damage the printhead.
An ink formulation can be identified to a specific manufacturer to ascertain the first date of commercial availability. He trained with and served as the Chief Research Forensic Chemist with the United States Secret Service and was responsible for maintaining the largest known forensic collection of writing inks in the world.
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The chemical analysis of writing and printing inks, as well as paper, can be invaluable when trying to prove whether a document is fraudulent.
Therefore the device will not be functional when there is no ink in order to avoid damaging the system.
For users who wish to print using just black ink (despite the reduced print quality), many HP printers offer options.