A group of thatched huts were built by the riverside of the smoking Qingque tribe. Under the huts, bricks were arranged in groups of five, alternating horizontally and vertically to form walls that were one meter wide, one and a half meters high, and more than ten meters long.

The brick wall runs east-west, with each brick wall more than half a meter apart. They are placed like this because after winter, there are more easterly winds here.

This is conducive to ventilation and better preservation of bricks.

These numerous bricks are the result of the hard work of the people of the Qingque tribe during this period.

In the excavated circular foundation, Han Cheng also put down the last brick, and the arch with a span of two meters was declared completed.

Then he called his second senior brother and asked him to come up and jump hard on it to test the solidity of the brick arch.

After some jumping, the brick arch was as solid as before, and a smile appeared on Han Cheng's face.

Then, I spent another two days working with Heiwa to build the internal structure of the kiln using bricks and some brick blanks from other places, taking into account things like air intake and smoke exhaust.

After waiting for a few days and allowing the soil to become solid, people would continue to carry soil and pile it around the kiln, slowly covering the previously built things.

And the soil that was carried was compacted using the tools used to tamp the walls.

There is a purpose for covering the outside of the earthen kiln with a thick layer of soil. Its biggest function is to keep warm.

This was a huge project and it took us half a month to complete it completely.

At this time, the rapeseed is already ripe.

Han Cheng let most of the people harvest rapeseed. He and Heiwa walked around the brick kiln with shovels, doing repairs from time to time.

Do what you love and love what you do. This saying is fully reflected in Heiwa.

He is very passionate about firing pottery, and also very passionate about various kilns.

Now facing this kiln that feels spacious even for a person to enter, his expectations are even stronger than those of Han Cheng, the advocate.

He had never thought about or dared to imagine such a big kiln, but now it was built and appeared before his eyes!

If such a kiln is easy to use and can be used to make pottery in the future, how many pottery pieces can be made from this kiln!

Looking at the brick kiln with smoke rising from the top due to the fire burning inside to dry the bricks, Heiwa thought with longing...

After dozens of acres of rapeseed were harvested in the field, the newly built brick kiln had been thoroughly dried. Under Han Cheng's command, five hundred bricks that had been made for a long time were sent into the kiln.

Then start lighting the kiln.

The brick kiln took so much effort to build, so its capacity is naturally more than this. However, this is the first time that the brick kiln is used to burn bricks in a real sense. No one, including Han Cheng, is familiar with the temperature, so they need to test and grope their way around it.

The amount of firewood needed to burn a kiln like this is far more than that of other small kilns. Bundles of firewood are directly added to the fire mouth.

There was a raging flame underneath the kiln and green smoke rising from above.

This fire lasted for two days and two nights before no more firewood was added.

The fire mouth was sealed, and the people, who had already made preparations according to Han Cheng's previous orders, began to use pottery jars to carry buckets of water from a small river not far away, came to the top of the brick kiln, and then poured the water down one jar at a time through the left opening.

The thick soil outside the brick kiln isolates the heat. Even though the temperature inside the kiln is terrifyingly high, the people carrying water and climbing up and down outside the kiln only feel that the soil is slightly hot.

The cool river water poured into the brick kiln from above, where it met the hot air and other things, producing a large amount of hotter gas, which filled the earth kiln...

After Heiwa poured down a jar of water, he was still a little dazed. He didn't understand why they suddenly had to pour water into the kiln when the kiln was being fired.

In this case, wouldn't all the bricks in the kiln be broken?

Apart from this result, he, who has been dealing with pottery for many years, really couldn't think of any other results.

The Son of God should know this better than himself, but he still let it happen...

This is what makes Heiwa even more confused.

Could it be that if this operation is carried out, there will be other changes that I am not aware of?

He squatted there, taking the water handed to him by others, thinking to himself about something that seemed so unreasonable and puzzling.

Of course there will be other changes. Without the watering process, blue bricks cannot be fired.

The reason why Han Cheng was so stubborn in wanting to make green bricks was not because the Qingque tribe also had a green in its name and he wanted the green bricks to match the Qingque tribe, but because under such conditions, green bricks were stronger than red bricks.

The red bricks commonly seen in later generations are all squeezed out by machines, and the density of the bricks themselves is very high. However, the bricks of the Qingque tribe are purely handmade.

Even if one used great strength when making bricks, the density of the resulting bricks was far less than that of later bricks.

The red bricks fired from such brick blanks are easy to become brittle and, under the same conditions, are not as strong as green bricks.

Blue bricks were gradually replaced by red bricks in later generations and were almost on the verge of extinction, which was not unrelated to the difficulty in firing them.

With the use of various machines in later generations and changes in kiln firing technology, a kiln of red bricks could be produced in three or four hours.

It is impossible to reach this speed with green bricks that need to be filled with water and sealed in the kiln.

Moreover, due to the movement of the machine, the fired red bricks are no worse than blue bricks, and are even stronger than blue bricks, so it is natural for blue bricks to be replaced.

Of course, under the current conditions, blue bricks are still the first choice for the Qingque tribe.

"This way the bricks will be stronger and easier to use."

Han Cheng touched the bricks mixed with sand, gravel and other things, and said to Heiwa who came down to ask after sealing the kiln.

Will it be stronger?

Are you sure it won't fall apart?

Heiwa was a little confused but didn't ask any more questions because he knew that what the Son of God said was usually not wrong.

But what is the reason behind this?

Heiwa scratched his hair, looking a little distressed.

The kiln was fired for two days, water was poured into it on the third day, and then the kiln was sealed. On the afternoon of the fourth day, amid the great anticipation of everyone in the Qingque tribe, the brick kiln was finally opened!

Looking at the kiln entrance from which hot steam was emanating, Han Cheng also clenched his hands nervously.

Although he knew what the final product would look like, he was still unsure whether the brick kiln he built could produce qualified products. After all, this was the first kiln.

Han Cheng stopped Heiwa, who was eager to know the result and wanted to go into the kiln, and waited here for a while. After making sure that the inside was ventilated, he put on a mask made of linen folded several layers and went into the brick kiln.

Heiwa and the others were dressed the same way.