The purpose of this chapter has been to study the Swedish copper commodity chain, emphasizing the export of copper and brass to France and the links between the Swedish copper trade and the French Atlantic trade system during the eighteenth century. Conditions during times of war are an important factor to explain the downturns in the Swedish copper trade. It is more difficult to explain how trade recovered and expanded in the periods between the wars. To influence copper production and exports, the Swedish state actively contributed in numerous ways. This survey shows how the state performed market investigations in France, how they helped French craftsmen to practice their industry in Sweden, and how they subsidized copper export for Swedish merchants. The data about the Swedish manufacture of copperproducts demonstrate that certain goods were intended for the slave trade and that some deliveries could be linked to several French merchants active in the French Atlantic trade system. An assumption based on the observations in this chapter is that Swedish actors were also investors in French slave and colonial trade expeditions. The business of supplying copper goods for barter on the African coast as well as for furnishing the sugar refineries in the Caribbean generated profits and promoted the industrial development in Sweden.