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Advances in Fingerprint Technology.pdf

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Figure 3.4a A chromatogram of a f<strong>in</strong>gerpr<strong>in</strong>t deposit extracted and analyzed<br />

shortly after deposition.<br />

In contrast, saturated compounds (e.g., palmitic and stearic acids)<br />

rema<strong>in</strong>ed relatively unchanged dur<strong>in</strong>g the same time period. Wax esters also<br />

rema<strong>in</strong>ed relatively stable. Overall, as the sample f<strong>in</strong>gerpr<strong>in</strong>t aged, compounds<br />

<strong>in</strong> the low molecular weight range began to form. These compounds<br />

would be consistent with lighter molecular weight saturated acids (e.g.,<br />

nonanoic acid) and diacids (e.g., nonandioic acid). Figures 3.4a and 3.4b are<br />

chromatograms of samples taken from the same donor and analyzed <strong>in</strong>itially<br />

and 60 days later. Overall, the results of the study <strong>in</strong>dicate that saturated<br />

compounds dom<strong>in</strong>ate aged samples. Unfortunately, these compounds do not<br />

make good targets for chemical reagents.

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