In these days of modern technology, we rarely, if ever, would dare to drink water directly from the tap or a pond as we are aware that it is unsafe due to the presence of disease causing bacteria, viruses and so on. In order to make water fit enough to drink, today we have UV filters and RO purifiers. In such a world, speaking of drinking water stored in copper vessel might sound anachronistic. Nevertheless, one quick look about the science behind storage of water in copper vessel and its benefits might be educative.
To know more about the benefits click here: Benefits of drinking the water which is stored in Copper vessel
Tarnishing in copper is due the chemical reaction between the molecules on the copper and the surrounding air. This chemical reaction changes the color of the copper. Since we are using copper vessel/jug to store the drinking water it is very essential to wash them every day.