A bottle that keeps you healthy. Introducing Mr. Butler Pure Copper bottle, exquisitely designed to perfection with glossy finish. Made from pure copper, it promises the health benefits associated with copper and is a perfect solution for health conscious customer. Instructions: Copper utensils needs to be cleaned at regular interval for removing the dark marks. Dark marks are formed due to oxidization process. It is the basic nature of Pure Copper that it oxidizes when it comes in the contact of air and water. How to clean the bottle: Put some lemon juice and salt in the bottle. Fill half the bottle with warm water. Leave aside for 10-15 minutes and shake well. Empty and rinse well 2-3 times with plain water. Clean once a week. Do not use scrubber or chemicals to clean the bottle. Do not use the bottles for storage of any other liquid, other than water. Do not keep the bottle in fridge or microwave.