If unlined, reacts with most foods, causing discoloration and mild toxicity if contact is prolonged. Unlined copper does not retain heat well. The traditional tin lining blisters or melts if overheated. Silver lining blackens on contact with the air and sulfurous compounds in some foods. Needs re-lining periodically.
Care Wash with hot, soapy water Never use scouring pads.
Soak to remove stuck-on food. Dry with soft cloth to bring up the shine. Use a proprietary cleaner for the outside, or rub with salt and vinegar or salt and lemon juice. Buff up the inside of silver-lined pans with a silver cleaner. Pros Nonreactive, inexpensive, retains heat well and, as it is porous, moisture.