Wait, how old is that? Because on Wikipedia it suggests that Xerox has been working on this at least since the 80s, and while it was only discovered in 2004, apparently everyone had been using these kinds of patterns for decades.
https://en.wikipedia.org/wiki/Machine_Identification_Code
B&W vs Color
You cannot print nearly-invisible yellow dots with only black toner, no matter how much you want to.
Wait, how old is that? Because on Wikipedia it suggests that Xerox has been working on this at least since the 80s, and while it was only discovered in 2004, apparently everyone had been using these kinds of patterns for decades.
https://en.wikipedia.org/wiki/Machine_Identification_Code
B&W vs Color
You cannot print nearly-invisible yellow dots with only black toner, no matter how much you want to.