Therefore, instead of identifying inkjet ink components (as was the case with the pen ink considered earlier), one should focus on obtaining and comparing the patterns of PEG ion distributions in LDI mass spectra. Not only can these patterns be used as fingerprints to establish the fact that two different printers were used to generate the suspicious printed document (Figure ), but matching them against the library of inks from different manufacturers (such as the one shown in Figure ) may allow one to establish the brands of the printers used in document preparation without the need for extensive chemical characterization of the ink.