Research Article
Combination of a Green and a Traditional Method for Estimating Relative and Absolute Ink Age: A Case Study of Ballpoint Pen Ink Dating in Vietnam
Table 1
Physical characteristics of papers.
| | Standards (TCVN) | Questioned documents | RSD (%) | A1 | A2 | A3 |
| 1 | Mass (g m−2) | 1270 : 2008 | 59.5 | 61.1 | 60.1 | ≤1.44 | 2 | Whiteness (ISO, %) | 1865-1 : 2011 | 91.1 | 90.8 | 90.7 | ≤0.25 | 3 | Opacity (%) | 6729-2008 | 86.2 | 88.6 | 88.4 | ≤1.74 | 4 | Bekk smoothness (second) | 6727 : 2007 | Side 1 | 59.3 | 62.0 | 56.5 | ≤4.67 | Side 2 | 27.5 | 28.8 | 27.0 | ≤3.72 | 5 | Air permeability (ml min−1) | 6891 : 2001 | 1385 | 1392 | 1356 | ≤1.57 | 6 | Thickness (mm) | N/A | 0.041 | 0.039 | 0.040 | ≤2.5 |
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