"Zila~~!"

A sharp dagger was put into the water by Zhao Yunxiang for quenching, after this process, the hardness of the dagger will be greatly improved, and the toughness will be reduced.

In order to make the dagger even more useful, he needs to perform one last process, which is carburizing!

The mud is attached to the blade of the dagger, dried, and then buried in the charcoal ash that has turned to ashes.

The function of carburizing is to remove burrs, which can increase the toughness of the blade without reducing too much hardness, and the cutting power of the burr is amazing.

"Is the kiln going to stop now?" Han Qianluo looked at the reddened pottery in the kiln, and the mud inside was burned red.

The temperature inside the kiln should be around 900 degrees Celsius now, and you can feel the scorching heat even from 4 meters away.

"Well, let's stop for now, I don't know how long it took to burn, but it's about the same. "Zhao Yunxiang worked hard to calculate the time, but unfortunately there is no clock, you don't know how many hours have passed.

In fact, the best time to burn pottery is 4 hours, the time is too short to melt the clay to crystallize, too long will cause the pottery to overheat and break.

This is a control of time and experience, and Zhao Yunxiang is still in the initial stage of exploration.

"Little brother, what else are you going to toss?" Lin Qingyu saw that Zhao Yunxiang was picking wood again, as if he was going to put it in the kiln.

"Before the kiln is completely cool, I want to make some charcoal!" Zhao Yunxiang nodded very seriously.

"Is it the kind of charcoal that eats barbecue?" Lin Qingxuan asked, "Or is it the kind of bamboo charcoal that absorbs formaldehyde and dispels moisture?"

The effect of charcoal is not the same as bamboo charcoal, in terms of burning and grilling, fruit wood charcoal is the most suitable, and the adsorption is slightly poor, but the adsorption of bamboo charcoal is super strong.

"As for bamboo charcoal, we can't use it for the time being, and the most needed thing is charcoal for cooking. Zhao Yunxiang selected dozens of pieces of wood that were not seriously decayed and slowly put them into the kiln.

At this moment, the pottery inside the kiln is still red, after all, it has been scorched by the fire for several hours, and it needs to be cooled slowly.

From the opening of the kiln, it is known that there is a clay pot that has cracked, and the crack is very large, and a stump is very obvious.

Now you can't take the pottery out, because it's burned red! The temperature from the heat to the ground temperature is a sudden cooling, and these things will burst like glass.

When the wood is put into the kiln, because the flame in the kiln fire pit has been extinguished, there is no open flame, only a thick layer of charcoal is burning, so the charcoal put in will be carbonized under the high temperature baking.

The principle of carbonization of wood is that in the case of lack of oxygen, the wood burns little by little, and in the absence of open flames, the wood is burned into carbon little by little.

However, after the burn has reached a certain level, it must be sealed to form a basic vacuum space, otherwise, the charcoal will turn into dust.

On the chimney of the kiln, thick smoke billowed from the wood, and because there was no open flame, the smoke was extraordinarily thick, almost white.

"Okay, seal the kiln now, and open it tomorrow after the kiln cools down!" Zhao Yunxiang sealed it with a blended yellow clay, leaving only a small hole, and let the carbonization of the charcoal slowly penetrate.

The hole should not be too large, as it will give the charcoal a chance to burn, and the spark will burn the whole piece of wood to ashes.

Of course, you can't seal the mouth, because there is no oxygen that can burn, and the outside of the charcoal will be carbonized, and the inside is still wood.

In a word...... Charcoal making is complicated. ok essay network

Before going to bed, Zhao Yunxiang drank a glass of honey lemonade, working by the kiln was really terrible, he thought that his skin was thick enough, but his face was still red from being roasted.

Night!

Zhao Yunxiang was lying on the bed tossing and turning, and he keenly caught that Han Qianluo went out with the twins, and he had been out for a long time now, but he heard the sound of water outside.

A couple of girls are washing their ...... outside Undergarments!!

"Teacher Han, are you sure that the little brother will not come out?" Lin Qingyu is wearing a grass skirt made of palm leaves at the moment, and this primitive dress is very panicked.

"When he's asleep, he usually doesn't come out except to pee and watch the fire. Han Qianluo washed his clothes with water, which was rainwater.

On the side of the shelter, there is a reef area where there is a puddle.

This puddle stores a lot of water, and the texture is limestone, because it has been affected by weathering for a long time, forming a strangely shaped pit.

Originally, Zhao Yunxiang also planned to use this pit to dry sea salt, but unfortunately, it was delayed because there were too many things.

The poor few people have been on the desert island for so long, and they have not eaten granular sea salt once.

After Zhao Yunxiang took a seawater bath just now, the water stains on his body dried out, leaving a layer of particles, but the goods shook and all fell to the ground.

"I hope it can get dry tonight!" Lin Qingyu shook his underwear and prepared to hang it on a high place.

A bamboo next to it is very good, there is a side branch growing very happy, about 2 meters or so, the girls can reach it.

However, the twin sister immediately stopped it, Lin Qingxuan pointed to the sky, "It's still cloudy, the ghost knows if it will rain tonight, you hang here, tomorrow you will either wear wet or not!"

"......" Lin Qingyu looked up at the sky, looked at the dark sky, pondered for a moment, and then nodded and said, "What you said is right!"

"Why don't we dry our clothes in a small shed!" Han Qianluo suggested, "This small shed can not only provide shelter from the rain, but the firewood burned in this mud stove can also provide temperature and be used to dry clothes!"

"Okay!" Lin Qingyu was suddenly overjoyed, and several girls dried their clothes on the bacon rack on the stove, and the bacon rack was covered with a layer of leaves, so that the underwear would not be stained with blackened oil.

"Whew~!" the gray fox crawled on the firewood, glanced at the pile of underwear on the bacon rack, and then shook his huge ears.

The hair on the little gray fox's body looked very smooth, and Han Qianluo wanted to tease it, but unfortunately, this little guy was very clever and didn't give Teacher Han a chance at all.

"Ah~~~!" Han Qianluo caught the fox for a long time but didn't catch it, and then, Teacher Han gave up.

This fox is super fast and very sharp!

Wild!

The courtyard of the sanctuary fell silent again, except for the sound of the sea breeze stirring the bamboo leaves.

The silence didn't last long, the bamboo fence seemed to be moving, and in the crack of the bamboo, a scarlet eye peered into the shelter.

The gray fox that was originally crawling on the pyre seemed to sense something, raised its head and stared at the eye, and just like that, they looked at each other for a long time......