18th century Indian sword was forged using unique technique
via International Business Times
A 75-centimetre long Indian sword made in the late eighteenth century and probably used in battle has been shown to be made of pure steel and crafted using unique forging methods.
Scientists and conservationists from Italy and UK used non-destructive techniques to study the cured, single-edged sword called shamsheer.
Craftsmen probably cast ingots to cool down very slowly before forging them carefully at low temperatures. Instead of plunging into a liquid, they allowed the blade to cool in the air. The shamsheer sword from the 18th century Wallace Collection, London.Dr Alan Williams
This is what led to the band-like pattern caused when iron and carbon crystallise into cementite.
The study, led by Eliza Barzagli of the Institute for Complex Systems and the University of Florence in Italy, is published in Springer’s journal Applied Physics A – Materials Science & Processing.
The high carbon content shows the sword is made of wootz steel, the kind used historically in India and Central Asia to make high-quality swords and other prestige objects.
Micro-etching was done to enhance the “watered silk” pattern of wootz steel though much of this has been obscured or removed down the years.
“A non-destructive method able to identify which of the shiny surface blades are actually of wootz steel is very welcome from a conservative point of view,” Barzagli said…