Could Defects on a Rubber Stamp be Reproduced on a Duplicated Rubber Stamp?

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Chi-Keung Li, Janesse Wing-Sze Hui

Author Information

Chi-Keung Li: Government Laboratory, Ho Man Tin Government Offices, 88 Chung Hau Street, Kowloon, Hong Kong Special Administrative Region, China.
Janesse Wing-Sze Hui: Government Laboratory, Ho Man Tin Government Offices, 88 Chung Hau Street, Kowloon, Hong Kong Special Administrative Region, China.

PMID: 31999356 DOI: 10.1111/1556-4029.14290

The examination of stamp impressions has been an integral part of questioned document examination since its inception. Matching in design details and unique defects has proven to be essential factors for rubber stamps and stamp impression examination. In this study, several duplicate stamps were made from various rubber stamp manufacturers in Hong Kong, from the same original stamp impression(s). The objective was to examine the stamp impressions prepared from these duplicated stamp products and compared with each other and to determine whether they could be distinguished from the source stamp impression(s); by comparison of the size and defects deliberated introduced onto the latter. Further consideration of this study was an attempt to create a perfect duplicate stamp from an original stamp impression. The results of the analysis showed that the quality of source stamp impression(s) and scanner device of the stamp manufacturing process, and the knowledge of the stamp manufacturer were critical to the quality and outcome of the duplicated stamp products. It is concluded that although a perfect duplicate stamp could only be made under several essential control conditions, it was still possible to create a duplicate stamp that replicated the features of the original when a high-quality source stamp impression was available.

document authentication forensic document examination perfect duplicate stamp rubber stamp stamp impression examination unique defects

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