Zhang Sihai wished he could slap himself in the face.
If he had known that Yun Chao was going to ask questions, he might as well have traded with Jia Mancang and sent Zhao Runchun off to Qingyang County.
I don’t know what that little brat Jia Mancang is up to. He left yesterday and hasn’t come back until today.
Don't you always like to answer questions with me? Come back!
Seeing Zhang Sihai's confused face, Yun Chao asked several other boys.
As a result, all the boys glared at Zhang Sihai so hard that Zhang Sihai wanted to curse.
Brother Chao asks you, you answer yourselves, why are you all looking at me?
Seeing that none of his boys could answer the question, Yun Chao looked at the potters again.
Several potters broke out in cold sweat.
I've always heard that my boss likes to ask questions and twitches when he can't answer them. I didn't expect that it would be my turn today!
Not only Yun Chao's boys, Ma Zhao, but also several potters looked at each other. They had been firing bricks for half their lives, but they didn't know why they made red bricks this way and green bricks this way.
Many people came to see the bricks in Tou kiln, and many helpers came to make bricks.
Among them are several village leaders who have been reformed through labor.
When the old foxes saw that Yun Chao's question had left his subordinates speechless, they began to curse on the spot.
Yun Er, what are you pretending to be? If you know the difference between burning red bricks and burning green bricks, I will take off your head and use it as a stool for you to sit on!
Originally he was dissatisfied with Yun Chao forcing them to work, but now that he saw Yun Chao pretending to be unreasonable, Qiu Hong, who had a hot temper, couldn't hold it back.
"Master Inspector, please explain to us why bricks become blue when watered and red bricks when not watered."
Others may not understand, so how could Yun Chao not hear it? The man named Qiu seemed to be asking for advice, but in fact he wanted to make a fool of himself.
Didn't you see the smile in the old guy's eyes? He was preparing to see his own joke.
Yun Chao's eyes passed over the faces of several Muramasa.
I found that every old fox was full of expectations, waiting to see his own joke.
So Yun Chao coughed twice, cleared his throat, and prepared to speak.
The reason why Yun Chao asked his subordinates about the principles of burning red bricks and burning green bricks was not to show off.
The main purpose is to develop everyone's thinking ability.
These people have lived in a closed environment for a long time, and many of them have lost their curiosity. No matter what they do, they just want to know what is going on, and never think about the why.
Ever since a group of boys followed Yun Chao, Yun Chao has been constantly inspiring them. Although there have been some results, the results are not particularly obvious and are far from reaching expectations.
Therefore, whenever Yun Chao gets a chance, he will take the trouble to guide them. Unfortunately, these guys don't know what to do and regard Yun Chao's good intentions as a scourge.
Although Yun Chao had never fired bricks before and did not know the specific process of firing red bricks and blue bricks, he already knew the principles after just listening to the introductions of several potters.
This is the power of knowledge. As a quasi-doctorate, Yun Chao can figure out the key points even if he studies agriculture.
"Everyone, listen, I will only say it once. If you are interested, you can go back and study it. If you don't understand something, you can ask me in private..."
Having said this, Yun Chao paused for a moment, wanting to see how everyone would react.
Unexpectedly, before he could speak again, Zhang Sihai jumped out: "Brother Chao, don't worry, we must listen carefully. What you say must be secret skills that can be passed down from family to family. Whoever doesn't listen carefully is the one who doesn't." It’s a fool!”
"Hmph, if anyone dares to spread Brother Chao's secret skills, I will fight him forever!"
"Yes, no matter who it is, as long as they do something sorry for Brother Chao, I, Ma Ming, will kill him!"
"..."
Several villagers were frightened.
How come these guys under Yun Er are so barbaric, shouting and killing at every turn? How many people have they killed?
Yun Chao didn't know whether to laugh or cry. The boys under him were almost frightened. No matter what he said, he thought it was a secret skill that could be passed down to his family, for fear that others would learn it and pass it on.
"Everyone be quiet. There is no need. You can pass on whatever I said today."
Yun Chao waved his hand to stop his boys from shouting any more.
"The bricks contain iron. If they are naturally cooled and the iron is in full contact with the air, they will turn red; if they are cooled by watering, all the kiln will turn into water vapor. If the iron and air are not in complete contact, they will turn cyan... "
Yun Chao tried his best to explain in vernacular.
Unfortunately, after five or six minutes of explanation, everyone was still confused. Almost everyone had expressions of confusion.
Although they don't understand the principle, everyone remembers one thing. Freshly fired bricks will turn red if they come into contact with air, and they will turn blue if they come in contact with water vapor.
In addition, many people also know one thing: there is iron in the bricks.
Others may still be confused, but Tiejiang Hu just nodded.
"Yes, my boss is right. Iron is made from stone. Why can't there be iron in bricks?"
Yun Chao was a little discouraged. After explaining for a long time, he only gave everyone a superficial understanding, but still failed to make them understand the specific principles.
Hey, there is such a lack of scientific knowledge, it’s really tiring!
The doubts on the faces of the old foxes disappeared, and the look at Yun Chao became complicated. Could it be that this boy is really like the legend of Mudleg, a money-spreading boy? Otherwise, how could he know so much?
If the fire is turned off and the kiln and bricks are allowed to cool naturally to allow air circulation and sufficient oxygen in the kiln, the iron in the bricks will be oxidized into ferric oxide.
Since ferric oxide is red, the bricks fired in this way are red.
If you wait until the bricks are fully burned and then continuously pour water into the kiln, because the temperature in the kiln is very high, the water will quickly turn into water vapor, which will prevent the circulation of air in the kiln and create an oxygen-deficient environment in the kiln. The ferric oxide is reduced to ferrous oxide.
Ferrous oxide is blue-grey, and the bricks will be blue-grey.
Green bricks are significantly better than red bricks in terms of resistance to oxidation, hydration, and atmospheric erosion, so the ancients would rather put water in the kiln than burn them into green bricks.
The "Qin Bricks and Han Tiles" in ancient China have been well preserved after thousands of years, which shows that the green bricks have excellent performance.
As for some red bricks fired in ancient times, they must have turned into soil again because they could not withstand the erosion of time.
This is what Yun Chao concluded, why the bricks left over from ancient times are basically blue bricks and there are very few red bricks.
Yun Chao took a sip of water and took a breath. Just as he was about to teach everyone a lesson again, a village guard came to report:
"Muramasa, the two Sanshui Town police officers who were here last time are here again. They said that Cao's inspection is urgent. Please come over quickly!"
