"Li Sihu said that charcoal can't strike iron, because he doesn't understand the secret method, there is a promise, now my sister tells you the secret method of striking iron with stone charcoal, these things you have to memorize and learn by heart, but you must not reveal them casually, you know?" Liu Jun advised.

Li Youwei nodded firmly, Liu Jun's statement of 'one heart' immediately made him distinguish Li Sihu and others from himself and others, but young people's thoughts are sometimes easy to be extreme, and the criteria for his distinction have become more extreme, and only those who can cut people for Liu Jun are considered 'their own people'.

Not to mention the secret method, the importance of the secret method to the people of this era is unimaginable to modern people, and modern people can search the Internet casually, and the recipe of braised duck neck stinky tofu is at your fingertips.

But in ancient times, a secret recipe could feed a large family for several generations, dozens of generations, and it was the basis for the entire family to multiply and spread out.

"Remember when we just pulled the charcoal back and stuffed it into the kiln? That kiln is called a distillation kiln ......, what is distillation? You think of it as steamed buns...... what do you mean by steamed buns? Haven't you ever eaten steamed buns? ”

The principle teaching was stuck here, and Liu Jun found that everyone had never eaten steamed buns, and after thinking about it carefully, there was really no memory of steamed buns and steamed buns.

"It seems that the yeast used for making dough has not been invented or has not yet been introduced here." Liu Jun muttered, feeling that he had found another way to make a fortune.

Yeast was invented very early, but the technology spread very slowly in ancient times, and some places ate noodles hundreds of years ago, and some places are still gnawing dead noodles.

The ancient 'dead noodles' are not the high-gluten high-temperature kiln-roasted food with a unique flavor now, but the 'stones' that are so hard that they can kill people, swallow them and get stuck in their throats, and eat too much constipation.

Go back and get the yeast out, and you're going to get rich again, and it's going to be big. But at the thought of making a fortune, Liu Jun's eyes turned cold, and today's incident told him that in this era, if a woman does not have the ability to protect herself, she will only be targeted by those disgusting guys if she gets rich.

"Dare to hit me and kill you." Liu Jun viciously added another handful of carbon to the furnace.

"The distilled charcoal will become coke, the principle is very simple, that is, through high temperature to remove the impurities in it, such as sulfur, phosphorus, etc., what sulfur and phosphorus are, you don't need to ask, just know that it is impurities. The iron made from such coke is not brittle. Seeing that Li Youwei was asking another question, Liu Jun hurriedly interrupted.

I don't have any knowledge of chemistry and physics, and if I really want to explain these elements to him, a few months is not enough.

"Coke is hotter than charcoal, do you look at this furnace again, do you see the air duct for air intake? Why was it built like this? Is it to preheat the intake air, otherwise the air is cold, and blowing into the furnace will blow the inside cold? ”

Liu Jun tried his best to explain in easy-to-understand vocabulary to ensure that Li Youwei could understand it, because Li Youwei would still have to do these tasks in the future.

Then it was the graphite tong pot, the mud fan, the casting, the bought iron was put into the tong pot, the furnace was opened, and the special shape of the anvil, hammer, clip scissors, etc., Li Shihu estimated that he did not expect that the whole set of household goods that he had never forgotten before was poured out by Li Jun casually, although it was not as good as the forging, but it was barely enough after quenching and carburizing.

Finally, the iron bar is on, stuck on the anvil and knocked into a thin sheet, Liu Jun's anvil has many holes, and the limited clip is carded, even if it is a novice, it can also knock out the iron sheet with the same thickness and shape, which is more standard than the professional blacksmith Li Sihu who knocked it out by hand.

After a busy meal, it was not until the third day that Liu Jun got a steel sheet that was small arm long, two millimeters thick, baked to a blue and elastic.

"It's not easy, it's been so long to get it done." Touching his gray face, Liu Jun sighed.

If Li Sihu heard his words, he would probably be so angry that he would throw him into the furnace, it was too annoying, without all kinds of knowledge in his previous life, he wouldn't be able to make this piece of steel for a thousand years.

However, Li Youwei picked up the steel piece and waved it twice, but asked suspiciously: "Sister, what can this iron piece do?" Do you make knives? Too soft, right? ”

Liu Jun smiled slightly and asked, "Do you know what kind of weapon, even if the old and weak women and children pick it up, they can kill a heavily armed knight?" ”

Li Youwei and Li Zhaodi shook their heads.

"Crossbow, but this thing is a controlled weapon, let's go back and make a few soft knives first." Liu Jun said.

It took half a day to knock out more than a dozen pieces of steel, pick two of them 20 centimeters long, open the edge, nail the grip, the grip is a belt buckle style, and the belt is connected together.

The soft knife is inserted in the belt, and it can be pulled out if necessary, and it is usually not a knife in the belt.

Don't look at it only 20 centimeters long, piercing people is a poke and a pair of piercing.

As for the kind of soft sword more than one meter long that is usually on TV, it can't exist at all, and when it's soft enough to wrap around the waist, it means that it's so soft that it can't cut people at all.

When he put the soft knife belt on his waist and stretched out the line of the waist under the spacious long skirt, Li Youwei blinked his eyes in a daze, and then reacted quickly, and looked away in a panic, but Li Zhaodi's eyes lit up, staring at Liu Jun's waist, and the flashing words in her eyes were two words - envy.

Li Zhaodi's eyes made Liu Jun react, and his fingers were drawn to his waist, which is not very thin, at least not as thin as Li Zhaodi, what is there to envy?

However, compared with when he first crossed over, Liu Jun's waist is indeed much thinner, long-term stretching and exercise, coupled with high-intensity labor, with the restraint of the upper abdominal belt and the moisturization of horse oil, his current organs are basically in place, body fat has decreased, stretch marks have been reduced, and a certain beauty has been restored.

At least not like when he first walked through, he even looked at it unappetizingly. It is estimated that he has been wearing loose robes, but now he is suddenly tied up, and the contrast is too great, which shocked everyone.

Thinking of this, Liu Jun teased: "Look at what I do, it's not as fine as yours." ”

Li Zhaodi, who usually doesn't talk much, rolled her eyes rarely.