Sequencing of intersecting lines by combined lifting process and scanning electron microscopy |
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Authors: | Robert D Koons |
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Institution: | Forensic Science Research Group, Laboratory Division, FBI Academy, Quantico, VA 22135 U.S.A. |
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Abstract: | The chronological order in which two intersecting writing or typed strokes were made can be determined for several combinations of writing media by scanning electron microscope (SEM) examination, a lifting and transfer technique using Kromekote paper, or a combination of the transfer technique followed by SEM examination of the remaining material in the intersection. When non-destructive examination cannot provide unambiguous determination of sequence, judicious choice by the document examiner of which technique to use for a given combination of writing media and paper type can be made using known characteristics of the materials involved. The range of line-crossings which can be reliably sequenced is greater using a combined transfer and SEM technique than when the examination is limited to either technique alone. |
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Keywords: | Documents Lifting process Scanning electron microscope Sequence Intersections Writing |
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