Ceylon cinnamon sub-cambium peeling: Koketta curved brass knife and manual quill rolling?

Harvesting and peeling true Ceylon cinnamon (Cinnamomum verum) is a refined manual art. Stems are harvested when sap flows freely after rains. The rough outer suberous bark is scraped off with a curved blade. The peeler then uses a small, pointed brass knife (Koketta)—brass is chosen because steel blades oxidize plant tannins, staining bark black—to make two longitudinal slits down the stem. By rubbing the stem vigorously with a smooth brass rod (Kekuna rod), the delicate sub-cambium layer loosens cleanly from the wood core. Paper-thin strips are joined together and rolled into 42-inch multi-layered concentric quills that curl tightly as they shade-dry.