Why do these white cups have a brown stripe running down them? Five reviewed cups from the early-May run share one mark: a rust-brown to iron-brown granular streak that runs directionally down the wall, standing a little proud of the pale glaze around it — a single weathered run against a clean cream ground. 2157 and 2158 carry the clearest examples; 2163, 2165, and 2166 each wear their own version, no two falling the same way.
What the streak actually is — iron in the clay, a mineral, a slip, something pressed into the wall — is never asserted here; the pages describe the rust-brown run exactly as it photographs, following the same caution the series keeps for rust veils and sand grit. The term is kept distinct from dark smears (darker grey gritty veins in a pale glaze) and from rust-veil (a broad crust that caps or washes a body, not a single directional run). Approved in the 2026-07-13 batch-15 ruling with five members.
See it on real pieces
2157, 2158, 2163, 2165, 2166 — or browse the rust-streak listing.
Each piece page links to its live listing on the Shopify store.