Copper discolors over time due to natural oxidation. This is called patina. The material may also show some stains. These are natural properties of copper and do not negatively affect drinking from a copper object. Pure copper reacts with oxygen, water, and residues in water, such as sulfur. It actually means that the object has a high copper content and works well to purify the water. The discoloration of the inside is not harmful. If the discolorations become too severe, you can clean the bottle, jug, water tank, or cup.
Copper vessels are only suitable for water, not for milk, citrus juices, and acidic liquids.
Do not wash in the dishwasher. Clean with natural soap, a soft sponge, and water at room temperature.
Do not expose to direct sunlight.
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