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Issues Related to Examination of Stamp Impressions: Identification of Stamp Impressions Forged by High Simulation Techniques
SHI Shao-pei;XU Yang;QIAN Huang-gui;XU Che(Institute of Forensic Science;Ministry of Justice;Shanghai 000;China)
2008(3):
20-23.
With the advance of science and technology,new problems related to forensic examination of stamp impressions,such as identification of forged stamp impressions made by high simulation techniques,examination of altered stamps,examination of tampered documents using genuine stamp impressions,examination of stamp impressions made with the same plate and sequencing of words and stamp impressions,are encountered frequently and pose new challenges for questioned document examination.In the paper,forging methods with high simulation techniques are presented,including transferring from genuine stamp impressions,duplicating by color printing and photocopying,imprinting by forged stamps made with laser carving,plate making and photosensitive making techniques.Characteristics of these forged stamp impressions are discussed;and examination approaches and key points are put forward.
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