Master Wuding's face was calm when he heard Liu Yu's bold guess, but this calmness brought a coldness that made Liu Yu feel cold after the wind gushed.

"How did the general know that the old man has a heavenly book?" After Master Wuding asked, he seemed to suddenly come over. He looked at Liu Liniang who had already gotten on the horse not far away, and sighed, "No wonder."

Liu Yu smiled and said, "It is said that the water splashed by a married daughter, let alone Li Niang is just your apprentice. Should the master answer my question? Is my guess correct?"

Master Wuding smiled faintly and said, "If the secret of heaven is leaked, my body may be hit by five thunders. The general said yes, just take it as it."

After saying that, Master Wuding boarded the carriage, which made Liu Yu look very bad.

Liu Yuxin said that this old nun is really a cunning person. After saying this, he would hide the change in his face before. Was her face changed drastically when she heard about Tianshu, or was her face changed drastically when she heard his guess? He could only guess it himself.

Although Master Wuding had already entered the carriage, Liu Yu still said, "Master Wu, don't regret it. If I take it seriously, I may not be able to tolerate people who are threatening the throne."

Master Wuding didn't reply, which made Liu Yu wonder what she was thinking in the carriage at this time.

Liu Yu did not send anyone back to the teahouse to take Su Min down directly. Su Min was in exchange for the exchange. Since Liu Yu had already let him go, he didn't want to go back on his word. What he had to do was to get the recipe first, and then try to assassinate Su Min, which would be a complete end. In fact, Liu Yu didn't care much about the true destiny. Since Master Wuding said that he was a person outside of the number of days, it means that history had turned after his arrival. Su Min is now a dog of a broken family, and no one believed that she had the emperor's fate.

Thinking of this, Liu Yu relaxed a little. He got on the horse and walked along with the carriage for a while, but suddenly felt that it was inappropriate again.

Sometimes, weakness is easily overlooked. It is precisely because Su Min is now in a downturn. She will not be noticed. If Master Wu Ding takes care of her behind her back and is really usurped the throne by her, wouldn’t it be a disaster for raising a tiger?

Master Wuding exchanged Su Min for himself. To put it bluntly, he asked someone who was familiar with alchemy to tell the recipe. The most suitable person for this "elixir" was the national teacher Wu You, so Liu Yu went directly to the gate of the palace. Liu Yu did not let Master Wu Ding enter the palace, but sent the guards to the palace to spread Wu You out, so that the "old lovers" met in the yamen outside the palace.

Before Wu You came, Liu Yu had already called a group of craftsmen from the Military Industry Institute. After all, Liu Yu was a little worried about Wu You. If this old charlatan got the recipe and said "forgot" something, then he would not be worth the loss.

"General, you're really careful." Master Wuding smiled in a sarcastic tone when he saw everyone coming to learn the formula.

"That's natural. Master, you are of such a high level and don't find more people to come, how can you understand your old man's knowledge? If one or two people come, these two are still foolish and cannot learn your superb skills. Then wouldn't you lose money?"

Master Wuding didn't say anything else, and Liu Yu also made up his mind to get the recipe for ginger.

Liu Yu was not in a hurry to leave. He felt that it was useful to stay. Although he didn't know the formula, he knew some chemical formulas. He could help me explain the authenticity of the formula and give these craftsmen some reasonable help.

Liu Yu did not leave, and Liu Liniang did not leave either. When Wuding Master saw the craftsmen of the Military Industry Institute who were transported by carriages, he was a little surprised. She had long known that the weapon research and development department behind Liu Yu was very powerful, and the invisible weapons that killed people on the battlefield were studied and improved by a group of people. In the past, she believed that these people should be great scholars or a group of craftsmen who were above the top. When she saw the real faces of these people, she realized that these people were just ordinary people who were ordinary people.

They looked ordinary but were dressed quite brightly. The main reason was that these people received very good treatment after joining the military office of the court, and they also had official positions, so they would no longer be troubled by yamen at all levels. Even the families of these people were protected by the court.

Liu Yu has always protected "scientific and technological talents". The identities of these people are also highly confidential in the Ministry of War, because once they are learned by foreign enemies and then pry away a few people, the military advantage of the Dashun Dynasty will no longer exist.

It was not until dawn that Master Wu Ding completely explained the formula and preparation method. The traditional method of making is to calcinate green alum containing iron substances to obtain sulfuric acid. The cost-effectiveness is too low and it takes a lot of manpower and material resources. The sulfuric acid concentration obtained is also very unsatisfactory and cannot meet the needs of industrial iron smelting.

Master Wuding’s method is actually a major reform.

During this period, Liu Yu was also listening. There was a piece of paper in front of him. He was fiddling with some chemical formulas himself, but because he hadn't been in contact for a long time, he confused himself. However, he was sure that the water used by Master Wu Ding to decompose mummies was concentrated sulfuric acid, because many of the ingredients in the formula involved sulfur and pyrite. Liu Yu was at least aware that nitric acid and hydrochloric acid were not played like this.

Seeing that the sky was already pale, Master Wuding was considered to have finished teaching the formula and wanted to leave. Liu Yu stepped forward and smiled and said, "Master, I really thank you for your hard work. I have a heartless invitation. I wonder if you can stay for a few more days to guide the people below and complete the production?"

Master Wuding said: "Isn't the general going back on his word and forcing himself to stay alive?"

"Where is it?" Liu Yu continued to smile, "I mean, Master Wuding should not walk around in Chang'an City these few days. I will send someone to take care of your Princess Hemin's daily life. You also know that what you are talking about is just a preliminary formula. Even if the people below me have the formula, they cannot handle some details well. You always need guidance from the side."

Master Wuding's face fell into a brief period of Ningliu, and then smiled and said, "Since that's the case, then follow the general's wishes."

"Thank you, thank you." Liu Yu seemed very polite on the surface, but instead ordered the guards, "Send the master to her back quickly... Master, if you don't mind, I will arrange your old residence, so that it is more convenient to get along."

Master Wuding nodded again, and Liu Yu asked the guards to send her back first, and he himself had to go back and rest first.

Wu You were listening all night. At this time, he came over very energetic and asked in surprise: "What do you want to do? You have to learn this for free...what is the use of water?"
Chapter completed!