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While carbon-14 dating cannot be used to date the knife itself, because it is metal and thus not a once living thing (steel does contain carbon, but this carbon may be from trees or coal and is not easily separated from the iron for testing).
However if the knife has a handle made of natural organic material (e.g, wood, bone, antler, ivory) this handle can be carbon-14 dated to obtain an estimate of the age of the knife.
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