Metallurgy of India: Many of us would have seen the iron pillar in front of the Qutub Minar in Dilli. That's over 1000 years old and still not rusted in spite of empires changing, weather changing and severe pollution of the capital city.Kollur Mookambika temple's iron pillar.
Similarly, the Kollur Mookambika temple's iron pillar in coastal Karnataka, where it rains 6 to 8 months in a year, at a very high 750 cm level per year, has not rusted in over 2000 years! And this was built by tribals of the region, and not some well known architects of the 1st millennium BCE.
