Question

which substances are used to clean green stains on copper vessels and to shine black is silver utensils?

Answer 1

Salt or lemon can be used to clean green stains ( copper carbonate) on copper vessels and shine black (silver sulphide ) on silver utensils.

Answer 2

Lemon juice, salt, vinegar and tamarind are used to clean green stains on copper vessels and to shine black is silver utensils.

Explanation:

• Copper is one of the soft and ductile metals.

• It is used to make fuse wires, utensils for household purposes.

• When the copper vessels are exposed to air, it reacts with the gases and moisture in the surrounding environment.

• It results in the formation of copper carbonate and copper hydroxide.

• These compounds cause corrosion in the copper material and forms a green colour.

• Silver when exposed to air reacts with sulphur compounds like hydrogen sulphide and results in corrosion.

• This leads the silver to become shine black silver.

• The lemon juice, salt, vinegar and tamarind have cleansing properties which helps to remove green/black layers.

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