Qutub Minar’s iconic 1600-year-old iron pillar is still completely rust-free. IITians decode the ancient science behind it’s evergreen surface
Published on: June 1, 2026, 1:51 a.m. | Source: The Economic Times
A 1600-year-old iron pillar in New Delhi remains remarkably rust-free, baffling scientists for centuries. Researchers discovered its resilience stems from its wrought iron composition, high phosphorus content, and a unique forge welding technique. A protective layer of misawite on its surface further shields it from environmental degradation.
