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NCJRS Abstract

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NCJ Number: 221352 Find in a Library
Title: Restoration of Impressed Characters on Aluminum Alloy Motorcycle Frames
Journal: Journal of Forensic Identification  Volume:58  Issue:1  Dated:January/February 2008  Pages:27-32
Author(s): Graydon Peeler; Stephen Gutowski; Harald Wrobel; Glen Dower
Date Published: January 2008
Page Count: 6
Type: Report (Technical)
Format: Article
Language: English
Country: United States of America
Annotation: This paper discusses a procedure to restore impressed characters on aluminum alloy motorcycle frames.
Abstract: The procedure involves the initial use of an acid etchant followed by the application of an alkali. The alkali, by itself, is an ineffective etchant, but when used after acid, it appears to enhance the contrast between the stamped and unstamped areas. This technique is superior to the practices of putting water on the restoration, the application of petroleum jelly, or the use of an oblique viewing angle to increase contrast. The results of this technique are permanent and easy to photograph. The method has now been used in casework on 11 motorcycle frames. Good restorations were obtained in nine of them. The Victoria Police Forensic Service Department developed a step-by-step method that involves the use of an acid etchant followed by a short exposure to an alkali, with a repetition of this etching cycle as required. The method has now been successfully used on a number of casework frames. Figures, references
Main Term(s): Forensic sciences
Index Term(s): Evidence identification; Motorcycles; Scientific techniques
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