Dating of Inkpad Seals Using the Extraction Rate Method: Preliminary Findings |
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Authors: | Biao Li M.Sc. Feng Bai M.Sc. Huayan Mu M.Sc. Ren Bao B.Sc. |
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Affiliation: | 1. Department of Document Examination, China Criminal Police University, , Shenyang City, 110854 China;2. Department of Criminal Investigation, China Criminal Police University, , Shenyang City, 110854 China |
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Abstract: | Inkpad seals are often placed on important documents, and determining the date when a seal was affixed can be important to assess the authenticity of a document. In this study, three different brands of inkpads and four different types of paper were used to make diachronic samples of the seals. A double‐solvent extraction method was employed to date the inkpad seals by comparing extraction rates with inks of known age. Cyclohexane was selected as a weak solvent, and chlorobenzene was selected as a strong solvent. After testing, curves were created to show the relationship between the extraction percentage of ink and the date of the seals. The experimental results showed that the extraction rate method was applicable for the relative dating of inkpad seals in some cases where the seal was placed on the document within 6 months. |
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Keywords: | forensic science document examination dating of documents extraction rate method relative aging inkpad seal dating of inkpad seals |
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