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Determining the sequence of intersecting gel pen and laser printed strokes--a comparative study
Komal Saini1, Ridamjeet Kaur, N C Sood
1Department of Forensic Science, Punjabi University, Patiala, Punjab, India. komal2saini@yahoo.com
Science & Justice : Journal of the Forensic Science Society
|February 4, 2010
Summary
Determining the sequence of intersecting gel pen ink and laser printed lines is possible using optical methods. This analysis aids in forensic document examination by revealing the order of marks.
Area of Science:
- Forensic Science
- Document Examination
- Optics
Background:
- Establishing the chronological sequence of markings is crucial in forensic document examination.
- Previous methods may lack precision in differentiating overlapping ink and print mediums.
Purpose of the Study:
- To determine the relative chronological sequence of intersecting gel pen ink lines and laser printed marks.
- To compare the effectiveness of stereomicroscopy and digital microscopy for sequence determination.
Main Methods:
- Utilized optical methods to analyze spectral reflection, sheen, skipping, and gaps at ink-print intersections.
- Observed intersections using both stereomicroscopes and digital microscopes.
- Examined various intersection scenarios including same/different colors and varying darkness.
Main Results:
- Successfully established the chronological sequence of intersecting gel pen ink and laser printed lines.
- Demonstrated the effectiveness of optical analysis for determining the order of strokes.
- Provided a comparative analysis of stereomicroscope and digital microscope performance.
Conclusions:
- Optical methods are effective for determining the sequence of intersecting gel pen ink and laser printed marks.
- Both stereomicroscopy and digital microscopy can be employed, with effectiveness depending on specific observational criteria.
- This technique enhances forensic document analysis capabilities.
