Forensic Examination of Ink Transfer on Folded Documents Using Different Writing Instruments and Paper Types

Abstract

Ink transfer on folded documents is an important phenomenon in forensic document examination, as it may provide valuable information about the sequence of writing, folding, and handling of questioned documents. The present study aims to investigate the transfer of ink impressions on folded papers using different writing instruments and paper types under controlled experimental conditions. Three commonly used writing instruments were selected for the study: Flair Ink Tanker liquid ink fountain pen, Rorito Fanta Flo Hi-Tech ball pen, and Hauser Germany XO gel pen. Writing was performed on three types of paper with varying porosity levels, namely bond paper (low porosity), A4 paper (medium porosity), and notebook paper (high porosity). A standardized paragraph was written on each paper type using the selected pens. The written documents were folded under two different time conditions: immediately after writing and after a delay of five minutes. For each condition, eight samples were prepared. After folding, a constant pressure of approximately 500 g was applied on the folded documents for a period of 24 hours to facilitate possible ink transfer. Following the pressure period, the samples were examined to detect the presence and characteristics of transferred ink. Examination methods included visual examination, stereo microscopic analysis, and ultraviolet (UV) light examination to observe fluorescence or transferred ink impressions. The study evaluates the influence of ink type, paper porosity, and folding time on the extent and visibility of ink transfer. The findings contribute to the understanding of ink behavior on folded documents and may assist forensic document examiners in the interpretation of transfer marks in questioned document cases.

Introduction

Forensic document examination focuses on analyzing questioned documents to determine authenticity, with special attention to ink behavior when documents are folded shortly after writing. A key phenomenon studied is ink transfer, where wet ink from fresh writing partially transfers to another part of the paper when folded under pressure, creating faint mirror-like or smudged impressions. These traces help forensic experts determine the sequence of document preparation (e.g., whether a document was folded before the ink fully dried).

The study investigates how ink transfer is influenced by factors such as ink type (liquid, ballpoint, gel), paper porosity (bond, A4, notebook), drying time, and folding pressure. Lower-porosity papers tend to retain ink on the surface longer, increasing transfer likelihood, while highly absorbent papers reduce it. Examination techniques include visual inspection, stereomicroscopy, and UV light analysis to detect and analyze faint impressions.

The literature shows that while ink composition, paper properties, and document examination methods are well studied, specific research on ink transfer in folded documents under controlled conditions is limited, creating a research gap.

The study experimentally examines ink transfer using different pens and papers, varying time intervals (immediate vs. delayed folding) and pressure conditions.

Conclusion

The present study systematically evaluated the behavior of different writing inks—ball pen, gel pen, and liquid ink pen—on various paper types using visible examination, time-dependent transfer analysis, stereomicroscopic observation, and ultraviolet (UV) examination. The findings clearly demonstrate that both ink composition and paper characteristics significantly influence ink transfer, penetration, and detectability. Ball pen ink exhibited minimal transfer and negligible fluorescence under both long-wave (365 nm) and short-wave (265 nm) UV light, primarily due to its oil-based composition and rapid drying nature. In contrast, gel and liquid ink pens showed comparatively higher transfer, greater penetration into paper fibers, and mild fluorescence, indicating their water-based composition and slower drying behavior. The study also highlights the importance of paper type, where bond paper showed controlled ink deposition with minimal spreading, while A4 and notebook papers demonstrated increased absorption and diffusion due to higher porosity. Microscopic examination revealed significant differences in stroke characteristics, including edge definition, ink penetration, and fiber interaction, which are crucial for forensic document analysis. Time-based observations confirmed that ink transfer decreases substantially after drying, emphasizing that timing plays a critical role in transfer evidence interpretation. Immediate folding resulted in maximum transfer, whereas delayed contact reduced visibility across all ink types. Ultraviolet examination proved to be a supportive but limited technique, particularly for ball pen inks, which showed no significant fluorescence. However, gel and liquid inks exhibited mild fluorescence, aiding in differentiation under UV conditions. Overall, this study establishes that a combined analytical approach—integrating visual, microscopic, and UV methods—is essential for reliable forensic document examination. It also reinforces that even basic laboratory techniques, when applied systematically, can yield meaningful results, especially in resource-limited forensic settings.

References

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Copyright

Copyright © 2026 Dhanshree R. Selukar, Ehitraj J. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.