Direct answer: Archaeological birch tar is birch-bark tar found in ancient contexts, often as adhesive, chewing material, repair compound, or residue on tools and objects.
Birch tar survives because it can remain chemically recognisable long after wood, fibre, and other organic materials decay. Researchers identify it through context, residue analysis, microscopy, and chemical markers. Some finds are linked to Neanderthals and the Middle Palaeolithic.
Archaeological birch tar tells researchers about tool hafting, craft skill, repair practices, container sealing, chewing habits, and sometimes ancient DNA. A small lump of tar can reveal behaviour that stone tools alone cannot show.
This article should separate archaeological evidence from modern recreation. A modern lump of homemade birch tar may look similar, but the archaeological value comes from date, context, residue analysis, and association with artefacts.
In short: Found on tools, ceramics, and as chewed lumps. Used as an adhesive and waterproofing material. Important in debates about early human and Neanderthal technology. Often identified through chemical analysis and archaeological context.