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The rumbling thunder went northwest.

A common summer rainstorm ends soon.

The clouds dissipate and the rain converges, and a scorching sun hangs in the blue sky again, scorching the earth like a fireball.

This kind of heavy rain comes and goes quickly.

But after the heavy rain, it was exposed to the sun. The humid and hot air evaporated from the humid ground made the entire valley look like a big steamer.

It is in this humid, hot and high temperature climate that all animals and plants grow wildly in summer.

The surroundings of the kiln factory were already covered by weeds and thorns more than one person tall, and the entire kiln factory was surrounded by dark green colors. Even on the stone courtyard wall, it was covered with green vines, and there were various flowers on it.

After more than half a year of wind and rain, the thatched huts and five small stone houses have begun to appear dilapidated and vicissitudes. There are still many vines climbing on the walls and roofs, and there are also many fist-sized melons hanging on them.

Four kiln workers surrounded the heat-wave earth kiln and were adding firewood to it.

Xu Chen stood far away under the pergola for making pottery, holding a banana leaf-like plant leaf in his hand to fan himself vigorously.

The weather is too hot.

I couldn't breathe.

He admired these four kiln workers very much. The kiln factory was even hotter in other places. If the rain was sunny, the kiln factory was like a baking workshop.

The kiln fire is smoked and roasted all year round. No matter how heavy the rain is, the water cannot be stored on the ground, and it will dry out in the blink of an eye. Especially for the earth kiln, even when it is raining heavily, the rolling kiln fire remains the same. The falling rainwater instantly evaporates into water vapor by the high temperature on the surface, making it look like a dragon above the earth kiln, rushing straight into the sky in the lightning and thunder.

Although heavy rain cannot penetrate the kiln fire, it will still take away a lot of heat after it falls on the surface of the earth kiln. Therefore, after each heavy rain, it is necessary to replenish dry firewood as soon as possible to increase the temperature of the kiln fire.

The four major bitternesses in life: burning kilns, raising boats, striking irons, and grinding tofu.

What we are talking about is that these four industries are the most tiring and hardest jobs.

The first thing to do is to burn a kiln is not only because of heat and fatigue, but also because of the smoke and burning of the kiln fire for many years, commonly known as the pyrotechnic lungs.

Perhaps because of the abundant oxygen in this era, these primitive people were tall and strong, so they were more adapted to this high-temperature, humid and hot climate. They did not feel that it was too hot when facing the temperature of the kiln factory.

Xu Chen should not be afraid, after all, he is also a savage body, but after traveling through time, he has been in a state of pampering and elegant state. He feels that his body has deteriorated very much and does not dare to get too close to the fire kiln, otherwise he will feel like he is suffocating.

This furnace of copper has been burned to the tenth day today.

Judging from the previous temperature of firing pottery, it has reached at least 800 degrees.

This temperature cannot completely melt metal copper, but maintaining this continuous high temperature can slowly oxidize non-metallic elements such as sulfur, carbon, phosphorus and other non-metallic elements in the ore.

However, because the earth kiln does not have a blower to continuously deliver oxygen, it relies on the chimney and fire holes to naturally intake air, which takes a long time to do this process.

However, according to the continuous refining and observations these days, the copper ore inside should be in the continuous refining stage.

In the first two days, the firewood smoke was large, and the rolling black smoke came out, which was similar to that of ordinary kilns. The black smoke slowly became less and became a faint yellow and black smoke, and the kiln factory began to smell.

This kind of odor is a gas released after impurities such as thio carbon in copper ores are oxidized.

As time goes by, this pungent atmosphere gradually weakens, and the smoke from the fire kiln has gradually begun to fade, and the color is almost invisible in the past two days.

The rainstorm has just passed. With the addition of new firewood, a burst of thick smoke has passed, the temperature of the kiln fire began to rise, and the white mist on the top of the kiln slowly dissipated, and then turned into a light blue color that was twisted and deformed like hot ions.

It seems that it's almost done.

A hint of relief appeared on Xu Chen's face.

In ancient Chinese Taoist priests, they believed that when the fire reaches the blue stage, it is the time when the fire is at its highest and purest, commonly known as the fire perfection.

In addition, the flame color reaction of copper ions is also blue.

The ability to release such a strong ionic color of the copper ore inside means that the purity of the copper should be quite high, otherwise the flame color reaction would not be so strong.

Thinking of this, Xu Chen couldn't help it, so he threw away the banana fan in his hand and walked to the front of the earth kiln under the sun.

"Rega, Rega, Molai!"

Although several kiln workers were sweating profusely and their thick hair was almost gone by the fire of the kiln, they saw Xu Chen jogging over and he shouted loudly and left quickly.

In such a hot place, if Xu Chen is exposed, they will feel guilty for the rest of their lives.

"Open the kiln door and take a look!"

Xu Chen's explanation of paintings and paintings.

"Haoga?" A kiln worker asked with joy on his face.

"It should be almost done!"

Xu Xiaochen nodded, so the four kiln workers quickly stopped adding firewood and dug up the ashes, found two wooden hoes, and carefully pried open a few fire bricks to the location of the kiln door.

The fire in the inner chamber of the earth kiln was blazing and the flames were blazing. The walls of the furnace and the inner walls of the ore were burned into red by the flames, like a pillar of fire. The rolling heat waves ejected from the kiln door, and almost ignited the hair of the two kiln workers in an instant.

"Bak, bake, go away!"

Several kiln workers quickly protected Xu Chen and retreated for two or three meters before stopping.

Because the inner wall is completely closed, it is not clear whether the copper is successfully smelted.

To know, you must pry open a brick blocked at the juice outlet on the inner wall.

Therefore, after Xu Chen's gesture, the two kiln workers leaned up again and poked it back and forth with a long wooden stick. As a result, a stronger flame gushed out from the kiln door, the two kiln workers' dry and scorched hair was directly ignited, and a burnt smell was instantly emitted.

"Wow, the water comes out!"

Although it was almost cooked by the kiln fire, the two kiln workers jumped up in surprise in an instant, pulled out the two wooden sticks that had been ignited by the kiln fire and threw them on the ground, pointing inside and shouting excitedly.

Xu Chen's body shook and quickly stepped up. Under the continuous rolling fire of kilns, he clearly saw that the red metal juice was indeed flowing out along the grooves.

"Dig the kiln door!"

"Take the mold, and take the pottery spoon..."

Xu Chen was very excited, and immediately a kiln worker took a wooden hoe to pry open the remaining fire bricks at the kiln door. As the grooves were unobstructed, the red copper juice flowed out along the grooves.

At this time, a potter brought a large pottery spoon with a long wooden handle, and some people brought a few clay molds that had been made long ago.

Xu Chen was excited and used a pottery spoon to the juice outlet and poured it into a mold.

The four kiln workers were more surprised and excited than Xu Chen.

Although they have been burning the kilns as Xu Chen’s request, no one knows why he wants to burn these messy stones.

But now they all understood that Xu Chen was going to burn the stone into this kind of water.

To turn stones into water, perhaps only gods can do it.

However, the temperature of this water is extremely high, which makes people frightened to see. I wonder what Xu Chen does to pour this water into the soil mold.

If they don’t understand, they just wait. They believe that they will be able to witness an unprecedented miracle today.

Just like burning pottery.

Xu Chen has proved the impossible with his magic again and again. What they witnessed today will surely be greater than pottery.

Under the surprise and excitement of the four kiln workers, Xu Chen poured copper juice into the mold one spoonful after another.

There are no good processing tools at the moment, so Xu Chen has planned it from the beginning. All the molds are not big, but copper is a high-density metal, second only to gold and silver among common metals. Therefore, the copper ore that has been burned for ten days in this furnace was not much refined in the end. After pouring seven or eight, no copper juice flowed out. In addition, a lot of sand fell on the ground was leaked below the juice outlet, and it was scattered and slowly solidified.

"Okay, go and turn the kiln fire away!"

After pouring the copper juice, Xu Chen was exhausted and sweating profusely. He was both hot and nervous and excited.

"Moga?"

The four kiln workers looked at each other, and their mouths were wide open and they felt incredible.

It was a kiln and chopping wood, which took more than half a month, but that's all the credit?

Their surprise and excitement were instantly like a scoop of cold water.

Logically, Xu Chen put a lot of stones in it and could burn water of almost the same pile or weight.

But obviously the investment is disproportionate to the harvest. This burns a little bit of water, and it is probably not enough to drink a few sips when it is cold.

But Xu Chen still has to listen to what he said.

Four kiln workers were depressed and pulled out all the firewood in the earthen kiln. The burning firewood was covered with sand, soil, grass and wood ash and extinguished. Large pieces of red charcoal were poured out with water, and dried and used as firewood and charcoal for later use.

These treatment methods are Xu Chen's usual requirements.

It is not easy to chop wood now, you can save a little blackjack.

In addition, there is no way to log and burn charcoal on a large scale. If it is forged and processed in the future, charcoal is an indispensable item. Only in this simple method can be stored in case of emergency needs.

In short, this upgrade task is almost starting from scratch.

At the beginning, a group of savages depended on themselves to make up their equipment.

Now that I am poor and have to find a way out of everything.

Although it is still in stand-alone state and has developed very slowly, the smelting of metal copper marks a qualitative leap in his upgrade task.

The copper texture is too soft and is not suitable for making metal knives, but it does not mean that it cannot be made at all, it is just not durable. In addition, making some exquisite blunt objects is much stronger than stones.
Chapter completed!