Ultrahigh-carbon “Wootz” "urukku" "Uccha" "उच्चा" from crucible carburization of molten iron was gift of "Tamil Nadu” to the world in 5th Century BCE

Ultrahigh-carbon “Wootz” "urukku" "Uccha" "उच्चा" from crucible carburization of molten iron was gift of "Tamil Nadu” to the world in 5th Century BCE