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

<div>HPTLC of A3.1, A3.2 (39-month-old), and M1 (50-month-old) developed in system B—ethyl acetate/ethanol/water (26 : 13 : 11 v/v).</div>

Journal of Analytical Methods in Chemistry

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Figure 5

Figure 5: 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 

Figure 5 | 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 