The students below the platform all craned their necks at these words, looking at the two pieces of material on the platform.
"Patrol Instructor, the two pieces are different colors!" one student called out.
Xu Qingtong nearly choked with anger when he heard this! Wasn't that stating the obvious? Anyone who wasn't blind could see that the two pieces were different colors!
Suppressing his discomfort, he continued, "Apart from their colors, what else is different?"
At this, a man of about twenty stood up and said, "Patrol Instructor, may I examine them up close?"
Xu Qingtong nodded, motioning for him to come forward.
The male student walked onto the platform, picked up the two pieces of material, which still retained some warmth, and turned them over and over for a long while before returning them to Xu Qingtong.
"Patrol Instructor, from my observations, the scarlet piece is pure metal-attribute material, suitable for refining magical artifacts such as flying swords. The other has the metal and earth dual attribute, making it more suitable for refining shields!" the young man said.
Xu Qingtong gave him an approving look and said, "This student's analysis was excellent, and everything he said was precisely correct! Why can the same material yield such different results? That is the study of materials!"
Afterward, Xu Qingtong introduced more than ten other basic materials to the students, explaining in detail how to purify each one.
At some point during his explanation, another person appeared at the back of the classroom.
The man looked to be in his forties, with long hair coiled into a bun and secured with a hairpin. A few short wisps of mustache lay against his lips, and his deep-set eyes looked especially bright.
When Xu Qingtong noticed him, the man gave him a slight nod