The tin coating on the Lagan makes them non-stick & easy cookware. Copper Lagan with tin coating are absolutely safe & can be used for cooking all types of food. Though you may not require kalai for deep frying since fats do not react with brass. Do not leave it on gas without oil as Kalai might melt leading to its early fading. Brass & copper being good conductor of heat, when used as cookware helps you save gas. They are a smart step towards sustainability." Brass & copper being good conductor of heat, when used as cookware helps you save gas.