Investigation and Discrimination of Ballpoint Pen Inks by Analytical Techniques and Chemometrics

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="2"> </td><td class="align_center" colspan="2">Cumulative variance (%)</td></tr><tr class="thead"><td class="align_center" colspan="2">Cumulative variance explained by the first 2 principal components</td></tr><tr class="thead"><td class="align_left">Ink color</td><td class="align_center">FTIR spectroscopy</td><td class="align_center">UV/Vis spectroscopy</td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td class="align_left">Blue</td><td class="align_center">94.227</td><td class="align_center">98.872</td></tr><tr><td class="align_left">Black</td><td class="align_center">95.787</td><td class="align_center">98.519</td></tr><tr><td class="align_left">Red</td><td class="align_center">98.893</td><td class="align_center">99.092</td></tr><tr><td class="align_left">Green</td><td class="align_center">96.935</td><td class="align_center">98.197</td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr><tr class="table-fn"><td><div>FTIR: Fourier transform infrared spectroscopy; UV/Vis: ultraviolet visible spectroscopy.<br/></div></td></tr></table>

<div>Cumulative variance (%) explained by PCA of ballpoint pen inks.</div>

International Journal of Analytical Chemistry

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Table 3

Table 3: Investigation and Discrimination of Ballpoint Pen Inks by Analytical Techniques and Chemometrics 