If he had known Yun Chao would ask a question, he might as well exchange it with Jia Mancang and go to Qingyang County to send Zhao Runchun off.
I don’t know what the little bastard Jia Mancang is doing. He went there yesterday and hasn’t come back until now.
Don’t you always like to answer questions with me? You’re back!
Seeing Zhang Sihai looking confused, Yun Chao asked the other boys again.
As a result, the boys all stared at Zhang Sihai with their eyes, making Zhang Sihai want to curse.
Brother Chao asked you, your answer is, what do you think of me?
Seeing that the boys under him could not answer, Yun Chao looked at the kilnmakers again.
The cold sweat of several kilnmakers came down with a silence.
I used to hear that my boss likes to ask questions, but I sucked my mouth when I can't ask. Today I didn't expect it to be my turn!
Not only Yun Chao's men's men, but several knives also looked at each other. They had burned bricks that they had been burning for half their lives, but they didn't know why it was red bricks that were burning like that, and blue bricks that were burning like this.
There are many people who come to see the bricks in the head kiln, and there are also many helpers who make bricks.
Among them are several village officials who have been transformed through labor.
When several old foxes saw Yun Chao asking, their subordinates were speechless, they began to complain in their hearts on the spot.
Yun Er, what are you pretending? If you know the principles of burning red bricks and burning blue bricks, I will take my head off and serve as a stool for you to sit on!
I was originally dissatisfied with Yun Chao's forcing them to work, but now I see Yun Chao pretending to be garlic again. Qiu Hong, who has a hot temper, couldn't help it.
"Sir, please help us solve our doubts. Why is it just a blue brick that is watered, and it just a red brick that is not watered?"
Others may not understand, but why can't Yun Chao hear it? The person surnamed Qiu seems to be asking for advice, but in fact he wants to see himself making a fool of himself.
Didn't you see the old guy's eyes full of smiles? Is this a joke to be prepared to see myself?
Yun Chao's eyes flashed across the faces of several villages.
I found that every old fox was full of expectations and was waiting to see his own jokes.
So Yun Chao coughed twice, cleared his throat, and prepared to speak.
The reason why Yun Chao asked his subordinates about burning red bricks and blue 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 people have lost their curiosity. No matter what they do, they just need to know the truth and never think about it.
Since the boys followed Yun Chao, Yun Chao has been constantly inspiring them. Although they have achieved some results, the effect is not particularly obvious and is far from meeting expectations.
Therefore, whenever Yun Chao has the chance, he will never tire of guiding them. Unfortunately, these boys are ungrateful and regard Yun Chao's kindness as a disaster.
Although Yun Chao had never burned bricks before and did not know the specific process of burning red bricks and blue bricks, he already knew the principle after listening to the introductions of a few kilnmakers.
This is the power of knowledge. As a quasi-doctoral doctor, even if he is studying agriculture, Yun Chao can figure out the key points.
"Everyone listens, I will only say it once. If you are interested, you can go back and study it. If you don't understand, you can ask me privately..."
Speaking of this, Yun Chao paused for a moment and wanted to see how everyone reacted.
Unexpectedly, before he could continue speaking, Zhang Sihai jumped out: "Brother Chao, don't worry, we must listen carefully, what you said must be secret techniques that can be passed down from family. Whoever doesn't listen carefully
It's a fool!"
"Hmph, if anyone dares to spread Brother Chao's secret technique, I will never end up with him!"
"Yes, no matter who it is, as long as I do something sorry for Brother Chao, I, Ma Ming, will kill him!"
“…”
Several villages were frightened.
Why are these boys under Yun Er so savage? They always shout and beat and kill? How many people have they killed?
Yun Chao was amused and crying. The boys under his command were almost frightened. No matter what he said, he thought it was a secret technique that could be passed on to his family, for fear that others would learn it and spread it randomly.
"It's all quiet, there's no need for that. What I say today can be passed on at will."
Yun Chao waved his hand and prevented his subordinates from continuing to yell.
"The brick contains iron. If it is cooled naturally and the iron and the air are in full contact, it will turn red; if it is watered and cooled, the kiln will turn into water vapor, and if it is not fully contacted by iron and the air, it will turn into cyan...
”
Yun Chao has tried his best to explain it in vernacular.
Unfortunately, after explaining for five or six minutes, I was still confused when I looked at everyone. Almost everyone had an unconscious expression.
Although I don’t understand the principle, I remember one thing: the newly burned brick will turn red when it comes into contact with the air, and will turn green when it comes into contact with the water vapor.
In addition, many people also know one thing: there is iron in the bricks.
Others may still have some doubts, but Blacksmith Hu nodded.
"Yes, the boss is right. Iron is refined from stones. Why can't there be iron in the bricks?"
Yun Chao was a little discouraged. After explaining for a long time, he only let everyone know the basics, but still failed to let them understand the specific principles.
Alas, I lack scientific knowledge, I feel so tired!
The doubts on the faces of several old foxes were gone, and the eyes of Yun Chao became complicated. Could it be that this kid is really like the legend of Mud Legs, and he is a boy who is scattered in wealth? Otherwise, how could he know so much?
If the fire is turned off, wait for the kiln and bricks to cool naturally, let the air in the kiln circulate and sufficient oxygen, the iron element in the brick will be oxidized into iron trioxide.
Since iron trioxide is red, the bricks burned like this are red.
If the bricks are burned through, water will be continuously poured 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 form an oxygen-deficient environment in the kiln.
The iron trioxide is reduced to ferrous oxide.
If ferrous oxide is blue-gray, the brick will be blue-gray.
Blue bricks have significantly better performance than red bricks in terms of antioxidant, hydration, atmospheric erosion, etc., so the ancients would rather work hard to water the kiln than burn it into blue bricks.
The "Qin bricks and Han tiles" in ancient China have been preserved in good condition after thousands of years, which shows that the blue bricks have excellent performance.
As for some red bricks burned in ancient times, they must have turned into soil because they cannot withstand the erosion of time.
This is why Yun Chao summarized it, and why most of the ancient ones were left with blue bricks, and few red bricks were there.
Yun Chao took a sip of water and took a breath. He was about to teach everyone well, but a village guard team member came to report:
"Munzheng, the two Sanshui Town staff who came last time have come again. He said that Inspection Commissioner Cao had something urgent to do, please come here quickly!"