printer serial number from printed document

[myselfborntowin]

Hi all,
If i got a printed document(black n white) , can i find from which printer it is printed.?
while googling i found that for color printed documents, there would be some hidden yellow dotes added with the printing content. Those dotes indicate the serial number of the printer from which it was printed , and this cannot be view by naked eyes. It would be clearly visible if we use blue lights in the dark room to read it.
please replay if any one knows about this.

[Salmon Trout]

Many colour and some monochrome (black and white) devices produce tracking dots in their output, but the makers will only reveal the identity of the printer to government agencies e.g. police.