Question

When is product the outer reddish coloured layer is rubbed off​

Answer 1

Explanation:

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Answer 2

Before painting of an iron object the outer reddish colour layer is rubbed off

Explanation:

• this is because there is formation of rust on the surface of iron. the rust has lesser capacity to hold paint as compared to iron.
• In addition to this while painting iron object the purpose is to increase the longevity of the iron because it prevents the moisture from coming in contact with iron and hence it prevents formation of rust. For this purpose the outer coloured layer is rubbed off

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