Know why THIS UNESCO-listed Delhi iron pillar has stayed rust-free for 1600 years - IIT-Kanpur cracks the code
Sunday, 25 May 2025 ()
Qutub Minar's 1,600-year-old iron pillar remains rust-free due to high phosphorus content and ancient forge-welding techniques, revealed by a 2003 IIT-Kanpur study.
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