Ink dating analysis

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Artificially aging of PEG 400 and a gel ink showed that as PEG degraded, the relative amounts of low molecular weight PEG oligomers increased, while those of high molecular weight decreased.

The degradation of PEG oligomers in a naturally aged gel ink was consistent with those in the artificially aged samples, but occurred more slowly.

In this study, a liquid chromatography–resolution mass spectrometry (LC–HRMS) method was established for the analysis of PEG oligomers in carbon-based black gel ink entries.

The coupled instruments achieve both the identification and quantification of PEG oligomers in ink entries with reproducible results.

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Carbon-based black gel inks are common samples in forensic practice of questioned document examination in China, but there are few analytical methods for this type of ink.Moreover, every living entity is endowed with information in the form of a genetic code.These information phenomena permeate the physical and mental world, and their variety is such that it has defied so far all attempts at a unified definition of information.Use of the term is not restricted exclusively to its communication via natural language.Information is also registered and communicated through art and by facial expressions and gestures or by such other physical responses as shivering.Interest in information phenomena increased dramatically in the 20th century, and today they are the objects of study in a number of disciplines, including philosophy, physics, biology, linguistics, information and computer science, electronic and communications engineering, management science, and the social sciences.