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Currently viewing the tag: "charcoal pigments"

Plasma extraction and AMS 14C dating of rock paintings (1997-14)

On December 31, 1997 By NCPTT

We developed a plasma-chemical technique to remove carbon from rock paintings. This extraction is followed by accelerator mass spectrometric analysis of the 14C to yield direct estimates of the ages of rock paintings. We have demonstrated use of the technique on charcoal as well as iron and manganese pigmented paintings. Unfortunately, there are no rock paintings made with inorganic pigments that have accurately known ages. That means there are no primary standards for checking the accuracy and validity of our technique on this type of samples. To compensate for this, known age samples (charcoal and Third International Radiocarbon Intercomparison wood) were dated: these support the general validity of this technique.

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National Center for Preservation Technology and Training
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Last Updated: July 31, 2012.
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