Is the copper bottle 100% pure copper? Yes, our copper bottle is made from 100% pure copper, ensuring all the health benefits associated with drinking from copper. Does the copper bottle change color over time? Yes, pure copper naturally oxidizes, forming a dark or green patina. This is harmless and proves authenticity. Clean it with lemon and salt or vinegar to restore shine. Is it safe to store water in a copper bottle overnight? Absolutely! Storing water in a copper bottle for 6-8 hours allows the metal to release beneficial copper ions into the water, which can help with digestion, immunity, and metabolism. However, avoid storing beverages as they may react with the copper. Does the bottle leak or smell? Our copper bottle is leakproof, ensuring no spills. Since it is made of pure copper, there is no plastic or chemical coating that could cause any odor. If you notice a metallic smell, simply rinse with warm water and lemon juice.