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Two chalcedonite artefacts from the Magdalenian site of Ćmielów 95 (Poland), with macroscopic features suggestive of thermal treatment, were subjected to a multi‐instrumental analysis. The red upper layer of the objects consists of ”protohematite”, implying temperature‐driven, goethite‐to‐hematite transition. The red layer shows traces of carbonized matter with saccharides and levoglucosan (from burning...
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