A recent scientific study published in the Delhi Archaeological Journal has utilized modern electron microscopy to analyze the protective 'misawite' layer on the Iron Pillar of Delhi. The research confirms that ancient Indian metallurgists intentionally used high phosphorus content in the iron to create a passive film that has prevented rusting for over 1,600 years, a feat of nano-technology before the modern era.
The findings suggest that the Gupta-era smiths possessed a deep understanding of chemical reactions and material science. This research debunked the myth of accidental preservation, proving that the pillar was a deliberate masterpiece of ancient Indian engineering and scientific prowess.