Tarnished and stained copper vessels are brought to a shine by using tamarind pulp.

Question

Give scientific reason:

Tarnished and stained copper vessels are brought to a shine by using tamarind pulp.

Answer 1

In due course, unus6d copper vessels are covered with a coating of black copper oxide and other compounds of copper which tarnish the vessel. Tamarind contains tartaric acid. When the vessel is rubbed with tamarind pulp, tartaric acid reacts with copper oxide and removes the layer. Thus, the copper vessel regains its shine.