hi Andrew
flooring is in domestic property ( tudor style house ) original floor when house was built,
flooring is all solid and intact, looks like specks of tar maybe tread in over the years or rubber off soles of shoes,
its got a half decent shine to it, the lady in question as been cleaning it with an house hold type floor polish ( same type used on laminates ) scratched a bit with finger naill, specks seam to be trapped in layers of polish
thanks again Conrad