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In case this is useful to somebody:

Because of corporate collusion with law enforcement dating back to the 80s, all colour printers put tracking information on their printouts, whether you're printing a colour document or not, encoding information that ties printouts back to the specific printer used.

https://en.wikipedia.org/wiki/Printer_tracking_dots

In 2018, scholars at TU Dresden created a tool to re-anonymize color-printed documents by obscuring that data:

https://dl.acm.org/doi/10.1145/3206004.3206019

The tool: https://github.com/dfd-tud/deda