The next morning, everyone drove to the deep mountains on the outskirts of Longquan to look for the abandoned mines of Laoxi.

"Bring the instrument down!" Emi Yagyu was dressed in sportswear, youthful and beautiful, full of energy. Instructed his men to remove a lot of equipment from the car and prepare to start looking for clues.

Metal Detector ...... Mining Analyzer ...... X-Spectrometer ...... There's actually a miniature sonar radar!

Yanagi Emi looked at Su Yuan, and said with some embarrassment: "If you want to do a good job, you must first sharpen your tools, these are all equipment that have been prepared for a long time, and I was originally going to come to the mountains to investigate and find the whereabouts of the covered soil." ”

Su Yuan waved his hand, there were many people to do things, let the others scatter and use the instrument to search, and he followed the clues he got yesterday and came directly to a small forest.

"There's a discovery!"

No matter how awesome the high-tech is, it can't compare to the golden finger, and soon a trace of golden light appeared in front of him, Su Yuan squatted down and grabbed a handful of air-dried soil, which was really different.

"Dig here!"

Xu Kui picked up the shovel and began to dig, Emi Yanagi also asked the bodyguards to help, five or six strong men started together, and soon dug a big pit more than two meters deep, and the golden light became more and more intense.

"That's it!" Su Yuan grabbed a handful of wet mud again, put it on his nose and smelled it, there was no earthy smell at all, it was quite fragrant.

"Is this the legendary mulch?"

Liu Sheng Huimei's face was full of excitement, she didn't care about getting dirty, she jumped directly into the big mud pit, picked up the yellow mud with both hands, and said obsessively: "The hard work paid off, and finally let me find it!"

Ru Zhi Bao held the yellow mud, ran to Su Yuan, and said excitedly: "Master, can these really be used to cover the soil and burn the blade?"

Xu Kui's face was also full of excitement, and he grabbed the yellow mud with his big hand, and asked, "Yes, master, can the oil quenching method also be used?"

Su Yuan nodded, and said inscrutablely: "If the ancient records are correct, these are one of the secret recipes used by the cadres to forge swords back then, according to the words of the ancients, containing the gold of the five elements, that is, various trace elements." ”

Take out the map, mark the location, call Jin Sanye, and ask the relationship to go through the mining procedures as soon as possible, there is a waste mine nearby, which has been mined after a hundred years, and it is just rented to cover people's eyes.

This kind of trivial matter is just a gesture for Jin Sanye, and the location coordinates were reported, and it was quickly approved, and this piece of feng shui treasure land was pocketed by Su Yuan.

After getting it done, he went down the mountain, and after eating at noon, Su Yuan asked Xu Kui: "Where is the best charcoal in Longquan?"

"If you want to say the charcoal with the best texture, it is the Li family charcoal kiln, which is really pine charcoal. Xu Kui introduced: "It's just that the price is too expensive, and only local tyrants can afford it." ”

Su Yuan looked at Miss Liu Sheng, who was eager to try next to him, in front of the real local tyrant, money was just a floating cloud.

Since ancient times, charcoal has been used to smelt iron ore, and the structure and mechanical properties of pig iron smelted from charcoal and coke are still different even if the chemical composition is the same.

The pig iron smelted by charcoal generally has the characteristics of fine-grained structure, tight casting, no cracks, and the pig iron produced with charcoal contains few impurities, which is suitable for the production of high-quality steel.

Especially in the sword casting process, charcoal is often used as a surface flux, when the metal is melted, the surface flux forms a protective layer on the molten surface, so that the metal is separated from the gas medium, which can not only reduce the splash loss of the molten metal, but also reduce the saturation of the gas in the molten material.

"Senior brother, I heard that there is a secret method in Longquan, smearing yellow mud on charcoal, which can increase the temperature and increase the success rate?"

Emi Yanagi looked at the black-faced god, although Su Yuan had not officially agreed to accept him as an apprentice, but secretly called Senior Brother Xu Kui and the other party did not object, which made the little girl excited.

"Well, this is the tradition of Longquan sword casting, of course, there are all kinds of chemical accelerants, as well as blowers, and many people have given up the ancient method and switched to high technology to improve efficiency. ”

Xu Kui didn't have a good impression of the little devil at first, but after a few days of contact, he found that the other party was well-read and reasonable, and he really looked like a lady.

In addition, he is also a swordsmith and is obsessed with swords, so he slowly changed his opinion of Emi Yagyu, and the relationship gradually became harmonious. Although the master did not personally agree to accept this little junior sister, a delicate little girl, as a daughter, ran back and forth to serve, who could bear to refuse?

"Let's go around in a while, if the quality is up to standard, it doesn't matter if it's expensive, the charcoal must be good!"

Su Yuan said: "All steel products that require high hardness and wear resistance on the surface, and have good toughness in the center must be carburized, and the carbon-containing mixture used to carburize steel products is called carburizing agent. ”

However, the carburizing effect of simple charcoal is poor, so the ancient method will add yellow mud, as a better carburizing agent, the wisdom of the ancients is profound and admirable. ”

Emi Yanagi and Xu Kui nodded desperately, the higher the level, the more they could discover the unfathomable depths of the ancients. Especially Huimei, the dignified 100 billion chaebol eldest lady, actually came to Longquan for a piece of yellow mud, which shows the fatal attraction of the secret recipe to her.

There is also Xu Kui, as a swordsmith in the list, the first person to cast swords in the famous sword villa, and the first time they met was because of the ancient method of oil quenching, and he kowtowed directly to the teacher. Of course, it is related to simple character, but the side also shows the influence of the lost ancient method on the master.

Su Yuan looked at the two cheap apprentices, one black and one white, and his heart was secretly refreshed, two words could be exchanged for two coolies, and he just wanted to ask:

Who else?

In the afternoon, everyone came to the kiln factory near the outskirts of the city, Longquan has two major characteristics, one is the sword, and the other is the more famous Longquan celadon.

After chatting, I learned that the people of the island country have a good respect for celadon and regard it as a national treasure. Yagyu Saemon is obsessed with the tea ceremony, and it is also because he bought celadon at a high price in Longquan in his early years, and he met Jin Sanye by chance, and the two became friends.

Every year, Jin Sanye spends at least a few million dollars to collect fine celadon as tea ceremony utensils, and yesterday he also called Huimei, saying that since he had a trip, he would bring some good porcelain back by the way.

Tea ceremony, sword way, incense way, calligraphy, and known as the island country self-cultivation and self-cultivation of the four avenues, especially the noble circle, the status is lofty, and the ancient six arts are almost the same, even the emperor must learn from an early age.

"Mr. Su is really knowledgeable, we burn real high-quality pine black charcoal, high density, high temperature, even if you burn for a day, there will be no ...... of ashes."

"Other people's homes burn low-grade charcoal, what water green gang, birch, hemp oak, bitter oak, elm, maple and other miscellaneous trees as raw materials, burned within three hours of waste will be wasted. No matter how good it is, it is used for poplar, linden, willow, etc., and the time is not short, but the smoke is too big, and the dust falls all over the ground......"

"Our raw materials are carefully selected pine, from Huangshan, have you ever heard of the famous Hui Mo? We use similar ...... to them."

"My Lao Li dares to pat his chest and promise, the whole Longquan you turn around, you will never find a second factory that can use the kiln to extinguish the fire and burn charcoal, the others are outside the kiln, when the wood is carbonized in the kiln, it is picked out of the kiln while it is hot, and then the method of extinguishing the fire with wet sand soil, the white charcoal burned out is not the same thing as our black charcoal at all!"