Printer manufacturers add unique yellow-dot patterns that are invisible to bare eye. These dot sequences allow the criminal examiners and the brands identify the specific printer used in crime. After this step, receipts and store information can take the law enforcement officials directly to the perpetrators or can be used to establish a linkage between the device and criminals; a trackable path. The dot sequence is different even in two printers that are produced by the same brand, during the same production cycle and are identical. So, it can be said that the yellow dot patterns serve as a kind of signature for each printer. To use BLIP, law enforcement officials compare the dot sequence on the documents they seized or were handed for check, and the dot sequences kep in BLIP’s dataset. BLIP’s dataset includes test-prints that are taken from printers before product releases, fake documents and money produced by governments and national reserves or departments of treasury to serve as examples of counterfeiting and forgery. The BLIP dataset also includes dot-patterns that are extracted from documents seized during earlier operations to allow the experts deduce whether the same people are attempting to commit the same crime, or if there any other, uncaptured, accomplices. The serial numbers of genuine banknotes and banknotes seized in earlier operations can also be found in BLIP’s dataset.