Dating paper ink
These tools are used, alone or in combination, to characterize the properties of paper in a number of ways.For example, a qualitative analysis shows what materials are in the paper, fiber, ink; quantitative analysis measures how much.Humidity also increases degradation, which can be explained by the basicity of the paper.The influence of heat on the degradation process was found to be rather weak.Moreover, it is possible to analyze the dye from a stroke directly from the paper (LDI-MS), so the sample preparation is minimized.The degradation of the dyes methyl violet and ethyl violet in strokes from a ballpoint pen was studied under laboratory conditions influenced by different factors such as light, wavelength of light, heat, and humidity.Each of these approaches provides a set of facts about an artifact's condition, age or origins.
Investigators have a number of analytical tools at their disposal, ranging from standard optical magnification, to exquisitely sophisticated molecular spectroscopy.
Several ink dating methods based on solvents analysis using gas chromatography/mass spectrometry (GC/MS) were proposed in the last decades.
These methods follow the drying of solvents from ballpoint pen inks on paper and seem very promising.
The results showed that the variations of relative intensities for the main dye components have a close relationship with aging time, and the degradation of the main dye components were significant under natural storage conditions, which can provide important evidences for dating of the ink entries on paper.► The gel pen ink entries have been differentiated by LDI-TOF-MS.
► The dye components of the ink entries have been identified by Q-TOF-MS.