Birch pitch is the glue of prehistory and early history. It consists solely of birch bark. Not only were arrowheads traded with it - birch pitch is also known as prehistoric chewing gum! In addition, it is still used for medical purposes even today. But how was this all-purpose stuff made in prehistoric times?
This is demonstrated by archaeotechnician Söhnke Raimann in the Archaeological Open Air Museum in Oerlinghausen.