Ceramics play a central role in the debates around the relationship between the Viru and the Moche. A recent model considers Negative and Moche-decorated ceramics produced by potters affiliated with the elites to be the cultural markers of the Viru and Moche populations, respectively. Due to the similarity of Viru and Moche plain-wares and the presence of Castillo Decorated ceramics in Viru and Moche contexts, this model sees both types of ceramics as domestic traditions, produced by independent potters and sharing a common technique. The research we present here supports this recent model by reconsidering the social and cultural meaning associated with these ceramic types: it uses a novel approach for South America of reconstructing the chaîne opératoire by studying the traces visible on ceramics at a macroscopic and microscopic scale. The study demonstrates how these potters used their own traditions to produce decorated and undecorated ceramics. Furthermore, we found that Castillo Decorated is a type produced only by Viru potters, and we argue that its presence in Moche contexts is evidence of the numerous exchanges maintained by these two populations.