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The US still does this today via the MIC: https://en.wikipedia.org/wiki/Machine_Identification_Code https://en.wikipedia.org/wiki/Machine_Identification_Code

• lights0123 5y ago
  > which certain color laser printers and copiers Inkjet printers are far more likely to not let you print without color ink, because they need to add the color inks to produce a darker black. Laser printers are far more likely to let you print without color toner (and as such, I've never worked with a laser printer that requires non-empty color toner cartridges), because they don't need to add additional colors for black.