This paper investigates samples of local cooking and utilitarian vessels from Roman contexts at Corinth. Based on macroscopic investigation, the vessels had been assigned to a single ware, but a recent instrumental neutron activation analysis showed that more than one fabric was present. To examine possible variations in shape and function as well as changes of shape over time, selected samples were subjected to thin section petrography, combined with refiring tests and elemental analysis (WD-XRF). The results reveal two main fabrics and one minor one with mineralogical compositions consistent with the geology of the north-eastern Peloponnese; one of them is tentatively linked to Sikyon and another has been identified as a regional product in earlier petrographic studies in the area.