Analysis of PEG Oligomers in Black Gel Inks: Discrimination and Ink Dating

The gel ink pen was first on the market of Japan in the mid 1980s [1]. Due to its smooth writing, quick drying, good color fastness and low cost, it has become a popular modern writing instrument [1–4]. Black gel inks that use carbon black as colorant, have such good color fastness that they can be written on important contracts, loan receipts or other credentials. In China, ink entries written by carbon-based black gel ink are common samples in forensic practice of questioned document examination.

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