A silvery gray, malleable metal, resistant to corrosion, much used in alloys. It is an essential ingredient in bronze and in pewter. Lead, when used for sculpture, is alloyed with it. It is also used in common solders. Painting on tin is often called tole. When used as a verb, tin refers to coating or plating with tin. Tin's symbol is Sn; atomic number 50; atomic weight 118.69; melting point 231.89?C; specific gravity 7.31; valence 2, 4.