Minerals and Metals in Ancient India v1.c27.s2.t2.33
Minerals and Metals in Ancient India v1.c27.s2.t2.33
- Language
- English
v1.c27.s2.t2.33
According to magnetic measurements (Bardgett and Stanners, 1963), the oxide film on the bright, polished section is less than 50 μm; immediately above this section it is 500-600 μm. If the oxide film is scraped off, the exposed iron starts to rust, and after a few years, the newly formed oxide cannot be distinguished from the main oxide of the pillar. This shows that the good state of preservation is mainly due to a protective film of corrosion products.