"Every summer when we go out alone, we always go to the nearby copper mine to ask the workers if anyone has mined natural copper..."
"Everyone, please look! This substance is called natural copper and is the main raw material for making the black jade intermittent paste..."
There was also a professor who was giving a lecture in the classroom. He took out a box from his backpack. It looked like an ancient gray-white color.
"Everyone, you see, this native copper is actually a type of pyrite, which contains sulfides. Just like the ancient cinnabar, it is highly toxic..."
"Then the question arises. Many people will definitely ask why this thing could be the raw material for the Black Jade Fracture Ointment, a panacea that can heal bones and prolong life."
"Actually, this needs to be processed. In our Chinese history, many panaceas were made by processing some extremely toxic herbs. From this we can see the wisdom of the ancients..."
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"Let's take a look at this first. Although I've made it a few times before, I'll watch it a few more times and accumulate experience. Maybe I can do better next time..."
Ye Ming carried Yi Zhiyue on his back and quietly walked into the classroom from the back door and sat down.
The professor who was preparing the natural copper upstairs was concentrating on making the black jade ointment that was said to be very magical in the novel, and did not notice that two students came in from the back door.
But even if I noticed, I wouldn't care. After all, today is the time for students to find their favorite courses and study. Often, students will sneak into the classroom from the back door to listen in on the class and see which class they are interested in...
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