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|Type:||Artigo de periódico|
|Title:||Fingerprinting and aging of ink by easy ambient sonic-spray ionization mass spectrometry|
|Abstract:||Using easy ambient sonic-spray ionization mass spectrometry (EASI-MS), fast and non-destructive fingerprinting identification and aging of ballpoint pen ink writings have been performed directly from paper surfaces under ordinary ambient conditions. EASI-MS data obtained directly from the ink lines showed that pens from different brands provide typical ink chemical profiles. Accelerated ink aging has also been monitored by EASI-MS revealing contrasting degradation behaviors for six different common ink dyes. As demonstrated for Basic Violet 3, some dyes display a cascade of degradation products whose abundances increase linearly with time thus functioning as 'chemical clocks' for ink aging. Analysis of questionable documents has confirmed the ink aging capabilities of EASI-MS. The order of superimposition at a crossing point has also been determined by EASI-MS. For two superimposed ink lines, continuous EASI-MS analysis has also shown that the EASI spray is able to penetrate through the layers and therefore both ink layers could be characterized.|
|Editor:||Royal Soc Chemistry|
|Citation:||Analyst. Royal Soc Chemistry, v. 135, n. 4, n. 745, n. 750, 2010.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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