Discussion
Which of the following is not a class characteristics of tool marks ?
Answer: D
Imperfections on the surfaces are not class characteristics of tool marks.
Class characteristics are features shared by a group of tools of the same type, such as the shape and size of the mark and the direction in which the tool moved. They narrow the tool down to a kind.
Imperfections on the working surface of the tool, nicks, burrs and wear marks produced in manufacture and use, are unique to that one tool. They are individual characteristics, which allow a mark to be matched to a particular tool.
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