Question

an old cycle frame was left in open for few days a layer got slowly deposited on its surface and original condition of the surface of a cycle frame cannot be restored what actually happened class

Answer 1

it is rusted and to restore it mark the ans as branliest
to remove it put some baking soda on that part after few hours rub with sand paper

Answer 2

Answer:

It is actually rust this happens due to the presence of moisture content in the air.