What Is Kalai? Understanding Tin-Lined Copper and Brass Cookware

1. The Chemistry of Unlined Cookware vs. Kalai

Copper and brass are outstanding thermal conductors, offering instant and even heat distribution. However, bare copper and brass react with organic acids present in tomatoes, tamarind, yogurt, and citrus. The silvery tin lining (Kalai) provides an inert, food-safe barrier that prevents direct chemical interaction with acidic foods.

2. How Kalai is Applied

Over a traditional hearth, the vessel is heated and treated with ammonium chloride (nausadar) flux. Pure molten tin is wiped swiftly across the interior with a cotton pad, bonding metallurgically with the substrate into a smooth silvery coating.

3. Caring for a Tin Lining

• Always use wooden, silicone, or soft ladles—never scrape with sharp steel spoons.
• Wash using warm water, mild liquid dish soap, and a soft sponge. Never use abrasive metal scouring pads on the tin.
• Never preheat an empty tin-lined pan over high heat, as tin melts at approximately 232°C (450°F).
• When the silvery tin wears thin and the copper or brass base metal becomes visibly exposed across food-contact areas, the vessel should be re-tinned by a professional Kalai artisan.