This fourth volume, "Into the Melting Pot", examines workshop waste and discusses the craftspeople in the Viking town of Kaupang including their activities, crafted products, raw materials, skills and networks. The study focuses on artefacts used in non-ferrous metalworking: crucibles, moulds, matrix dies, tuyères and a unique collection of lead models.

The tools and the waste material provide a completely new understanding of the craftspeople who where working with gold, silver, copper alloys, lead and tin. These metalworkers mastered many different materials and techniques; indeed, they were well-informed, well-trained and skillful, and manufactured a range of different items for women and men. There is every reason to believe that visitors and residents perceived the non-ferrous metalworking as a defining feature of the Viking-period town.