Which is the best material to make cans for food storage copper zinc or gold?

Neither copper nor gold is suitable for making cans for food storage. Copper and gold are both relatively soft metals, and gold is expensive. They are not suitable for making food cans because they are not strong enough and they can react with the food, causing contamination. Tin-plated steel is the most commonly used material for making food cans because it is strong, corrosion-resistant, and relatively inexpensive.