Abstract This contribution synthesises the PIXE and ICP-AES elemental analyses carried out on a large dataset, comprising of 300 copper-alloy objects dating mainly to the Late Middle Ages. The objects are drawn from heritage institutions and archaeological contexts in various regions between the Meuse and the Loire rivers (France and Belgium). This investigation focuses on the main elements that make up the alloys (Cu, Zn, Sn, Pb). Past studies have often defined the composition of an alloy as an intentional choice, however in this paper we aim to identify the constraints in alloy manufacture in a bid to understand the degree of freedom enjoyed by craftsmen during this period. We will also evaluate to what degree the constraints imposed by technique, economic conditions and social requirement, affected production in a complex multifactorial system. We have opted to define alloys by object type, functional area and social context, by chronology and product ranges. For cast table- and the kitchenware, we have observed that alloys and the objects are standardised on a trans-regional scale. Conversely, the hammered objects are produced with a greater freedom, leading to a new hypothesis regarding specific workshop practices. Finally, we will propose a predictive model for cast objects that we hope is better suited for the study of heritage objects, their materials and their production processes, to be verified in future studies. This approach emphasises the importance of considering everything that makes an object what it is: its function, status and place in the market, when researching heritage materials.
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