"Because the armour plates are made rather thin," Wei Ruo replied.
Wei Mingting took a closer look, and indeed they were thinner than he had expected.
Wei Ruo went on to explain: "Father, rest assured, although these plates are thinner, their hardness is not compromised. They can withstand regular sword attacks."
"Why is that?" Wei Mingting asked.
"In the process of smelting the steel used for this armour, large quantities of fluorite were employed. During the manufacture, copper was added. After the workpiece was formed, it was placed into a crucible, covered with charcoal, soya bean paste, and loamy powder. The workpiece was then carbon-infused by heating it externally, ensuring stable and even carbon penetration, and boosting the carbon potential. As a result, it has good ductility and at the same time a markedly increased strength."
"How did Ruoruo gain such knowledge?" Wei Mingting couldn't help but ask.
