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Misleading residues on lithics from Star Carr: identification with Raman microspectroscopy

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JournalJournal of archaeological science
DateAccepted/In press - 22 Mar 2018
DateE-pub ahead of print (current) - 30 Mar 2018
Volume19
Number of pages9
Pages (from-to)430-438
Early online date30/03/18
Original languageEnglish

Abstract

Ancient trace residues left on stone artefacts by people represent a source of potentially fruitful data about diet, technology, and behaviour, but their investigation is not problem-free. Rather, correct identification of degraded residues and determination of their natural or anthropogenic origin remains at the heart of current methodological development in lithic residue analysis. It is increasingly becoming clear that reflected visible light microscopy (VLM) is insufficient to make secure identifications of ambiguous residues. Confocal Raman microspectroscopy (micro-Raman) is a non-destructive technique that can identify the specific molecular nature of microscopic residues with high spatial resolution. Here, the identification of artefact residues as anthropogenic by visual inspection alone was found to be incorrect in all cases tested. Micro-Raman provided the key source of information to unambiguously determine the chemical nature of residues and hence their origin.

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