Han Cheng looked a little disappointed when he saw the unburned wooden sticks revealed after the soil was dug up.

This method really doesn't produce any carbon.

These tree sticks that were dug out were very similar to those burning tree sticks that were suddenly extinguished by water. They all had a layer of black carbon on the outside and unburned wood inside.

This thing is very different from the carbon that Han Cheng had seen in later generations, and it cannot be called carbon at all.

Although he felt that this method was a bit mysterious before he opened it, he still had some expectations. Now that it was opened and the truth was revealed, it was inevitable that he felt a little disappointed.

Wu, who was standing aside and watching, was also filled with disappointment.

Last night he had been expecting that these firewoods that were solemnly buried in the soil by the Son of God would undergo some changes, preferably by growing more firewood.

Now that he saw the result was like this, he felt uncomfortable.

I felt that the broad road I had imagined was much further away from the tribe, and it seemed to be completely blocked by thorns...

Han Cheng was now in a state of distress. He only had a vague idea about how to make charcoal. His first attempt had failed, and he had no better solution to think of for the time being.

Looking at the people who were surrounding him and looking at him in confusion, he asked them to continue with the work that they had not finished yesterday.

Tietou and others went to harvest the thatch, and Bo and others cut wood into pieces, burned them in the fire, and then polished them.

Han Cheng squatted beside the somewhat messy fire pit. Unwilling to give up, he picked up a piece of wood that was burnt black on the outside, placed it in front of his eyes and studied it carefully, with a thoughtful look in his eyes.

In this situation, Han Cheng suddenly wanted to recite a poem, the famous "The Charcoal Seller" written by Bai Juyi.

It was not that I lamented the difficulty of burning charcoal, sympathized with the old man's difficulties, or was indignant at the disturbance caused to the residents by the palace market, but it reminded me of the experiences of the charcoal seller in making charcoal.

The charcoal seller was cutting firewood and burning charcoal in the southern mountains. His face was covered with dust and smoke, his temples were grey and his fingers were black...

The first two sentences describe the hardships of the charcoal seller in making charcoal, but Han Cheng saw something else through this layer.

His method of burning charcoal really doesn't work.

Because judging from the charcoal seller's experience, he was most likely a lonely man, old and weak. If he used the method used by Han Cheng to burn charcoal, not to mention other things, just covering the burning firewood with sand would be difficult to do.

Because the covering was slow, all the branches were burned by the fire, so where would the carbon be?

Han Cheng didn't know what others had read from "The Charcoal Seller", but at this moment he definitely read from it that his method didn't work, although he couldn't explain the reason clearly.

Wu stayed here with Han Cheng for a while, then got up and returned to the tribe. After hesitating for a while, he came to the edge of the rabbit pen and lay there to pet the rabbits as usual.

But compared to the past, I seemed a little absent-minded when petting the rabbit today.

Han Cheng squatted there and thought for a long time. When he stood up, his legs had no feeling. After staying there for a long time, he gradually came out of this pain.

He called Heiwa, and together they carried firewood and walked towards the earthen kiln near the stream.

As the weather gets colder, Heiwa hasn't made clay molds for pottery for several days.

Heiwa and Han Cheng placed the firewood they were holding next to the earthen kiln, feeling somewhat puzzled. The last batch of clay embryos had been fired a few days ago. So why was the Son of God coming to the earthen kiln with firewood at this time?

Are you going to use this earthen kiln to make charcoal?

Heiwa is not a stupid person. Considering what the Son of God had done before, he quickly guessed Han Cheng's intention.

But the confusion in my heart became even stronger.

He is the one who deals most with this earthen kiln in the entire tribe. The earthen kiln has excellent ventilation, and once firewood is put in, it will burn fiercely.

Now that the Son of God has brought so much firewood and put it into the earthen kiln, won't it all be burned? How can there be any charcoal left as the Son of God said...

Han Cheng was also thinking about this matter in his mind, but he didn't have much clue. He could only experiment little by little and gain experience from repeated failures.

With Heiwa's help, firewood was put into the kiln where the clay pieces were originally placed, and firewood was also put under the kiln.

The top of the earthen kiln was blocked by two large pottery slabs. After Heiwa took out a primitive fire starter and blew out the flame, he looked at the Son of God with an inquiring look.

Han Cheng naturally knew what Heiwa meant. After a slight hesitation, he nodded slightly.

After getting Han Cheng's confirmation again, Heiwa no longer hesitated. He first lit the hay and then the dry firewood. Not long after, the matches at the stove mouth under the earthen kiln, which was specially used for burning fire, were burning fiercely.

Not long after, the firewood placed in the earthen kiln also started to burn.

With so much firewood burning together, the fire was very strong. Even though the earthen kiln was covered with ceramic plates, the hot flames still came out from the cracks around it and shot up high.

Heiwa looked at all this and suddenly remembered that the Son of God had asked people to cover the burning firewood with sand yesterday, and he couldn't help feeling anxious.

After all, this earthen kiln has a great use, and he also spent a lot of effort to build it. If it was buried like this, wouldn’t it be a pity?

Then he looked around and found that there were only Shen Zi and himself here, and they didn't bring any bone shovels, so it was obvious that they would not bury the earth kiln. This made him, who loved kiln firing, feel relieved.

But he soon realized that something was wrong. If he didn't cover it with sand, wouldn't all the firewood in the kiln be burned out?

Han Cheng had already considered this before. Flames need oxygen to burn, and he still had this most basic common sense.

After watching the fire for a while, he asked Heiwa to go to the side and move the broken large pottery pieces and some stones discarded there to the side of the earthen kiln.

After waiting for a while, he asked Heiwa to use these things to block the fire hole under the earthen kiln little by little.

As the fire mouth shrank little by little, the air entering it decreased slowly, and the flame lost its previous arrogance and became much smaller.

However, the flame inside the earthen kiln was still not completely extinguished. This was related to the gap at the firing port below the earthen kiln. After all, Heiwa used pottery fragments and other things to block the firing port, so it was impossible for there to be no gaps.

Han Cheng is now in a dilemma. If he doesn't seal the fire hole completely, he is worried that the firewood inside will turn into ashes. If he seals it completely, he is afraid that the firewood will be half-cooked like what he dug out from the ground today, which is also uncomfortable.

After struggling for a while, I finally decided to try burning it this way first. If it doesn't work, I will use mud to completely seal the fire mouth next time.