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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, four different brands of inkpads and three different types of paper were used to make diachronic (age-changing) samples of the seals. An oil diffusion (migration) method was employed to date the inkpad seals by comparing diffusion (migration) distances of a blending agent (castor-oil or chlorinated paraffin oil) of the same stamped impression measured at different times or by comparing the mean oil diffusion width associated with the purported date and the mean oil diffusion width associated with the suspected date. After testing, curves were created to show the relationship between the diffusion distance of ink and the date of the seals. The experimental results showed that the oil diffusion method was applicable for the dating of inkpad seals under certain conditions.