Re: Portraits Made with a Single Sewing Thread Wrapped through Nails
lagta hai science mei kamsoor han 
Galvanized nails are a special type of nail used in construction. Galvanized nails have undergone a special galvanization process, which involves covering them with a zinc coating in order to form a protective barrier. This barrier also works as a sacrificial anode, which means the coating will dissolve before the metal inside does, if the barrier itself becomes damaged.
Zinc oxide, which is a fine white dust, is used on galvanized nails because it does not breakdown the surface of the metal beneath. In addition, the zinc does not destroy the integrity of the galvanized nails. The protective barrier zinc oxide provides on galvanized nails has many advantages. First, it prevents oxidation from occurring. In this way, galvanized nails are highly resistant to rust and corrosion.