Mystery of Delhi's Iron Pillar Unraveled
http://www.expressindia.com/fullstory.php?newsid=12824Metallurgists at Kanpur IIT have discovered that a thin layer of misawite, a compound of iron, oxygen and hydrogen, has protected the 1,600-year-old cast iron pillar from rust.
Submitted in section: Archaeology: Regional: Asia: India: Mystery of Delhi's Iron Pillar Unraveled