The entire lecture room covers an area of less than one acre, but it is full of hundreds of people, which shows how high everyone's enthusiasm for Qingtian Sanren is. Of course, not all of the people here are alchemists, and a large part of them just come to watch the excitement.

After another quarter of an hour, a dignified old man strode into the lecture room and came to a small high platform in the middle of the house. The high platform is not large, only two zhang square, with a table, two chairs, and a large alchemy furnace on it.

This Qing Zhen old man is the head of the Alchemy Academy, Qingtian Sanren, who has built the cultivation of the seventh layer, because of the perennial alchemy, there is always a fragrance of spiritual grass and a burnt smell of pills.

At the beginning of each month, when the Alchemy Academy will send alchemy, the lecture room of the Dao Chuan Gong Hall will explain the basic knowledge of alchemy to everyone, and Qingtian Sanren, as the head of the Alchemy Academy, will occasionally come, depending on his mood, or whether he has time himself.

Qingtian scattered people come over, it will definitely not be like those low-level alchemy, only explain some basic knowledge, but some more advanced theories, after speaking, the people below are allowed to ask questions casually, such an opportunity is extremely rare, and it should not be missed, so among the people who listen to the lecture in the Dan room, there are also many people who like Danshu in the younger generation.

Sitting down on the chair, Qingtian Sanren cleared his throat and said: "The jade furnace smelts the elixir, the righteous path cultivates the longevity pill, exhale and breathe by me, the sexual hollowness is boundless, and the silence can be forgotten about me, in order to see the nature of the precursor of life, the lead and mercury are handed over to the divine pill, and the immortals of the Qiankun Ming original system are ......"

Qingtian Sanren recited a mouthful of Taoism, and the entire lecture room suddenly quieted down, only the voice of Qingtian Sanren echoed around, and the people below were in a variety of postures, some people were thoughtful, some people suddenly realized, some people frowned and tangled, some people were overjoyed, maybe they heard the key point, and some people straightened their ears and looked at the stage with anticipation.

Before this, Qingyang had never been in contact with the art of alchemy, and he seemed to understand it below, and it seemed that every sentence was unfathomable, but if he thought about it carefully, it contained the truth of heaven and earth, which was not only the art of alchemy, but also quite useful for cultivation, and he soon immersed himself in it.

Qingtian Sanren's explanation, for those who listen attentively, it is the sound of heaven, and they don't feel that time flies quickly, for those who are not interested, it is an ordeal, and they can't wait to end it soon, Lu Dingshan scratched his ears and cheeks beside him, he couldn't understand a word, and he regretted that he came in at the time, but Qingyang listened to it with relish, and became more and more fascinated.

I don't know how long it took, Qingtian Sanren finished talking about everything, so he said: "If anyone has something to understand during the alchemy, you can ask me questions." ”

At this time, a thin middle-aged man stood up and said: "Uncle Qingtian, Uncle Qingtian, I have been studying Danshu for more than ten years, at first I was to identify various spiritual herbs and materials, and then I tried to refine and purify various materials to be familiar with the basic alchemy steps and methods, and later collected a lot of Dan prescriptions, and also tried to refine a lot of pills, it can be said that I have also made small achievements in Danshu, but I have a question that I have never understood." ”

This thin middle-aged man is in his forties, and he has a third-level cultivation of Qi refining. From the whispered discussion of the people next to him, Qingyang figured out the identity of this person, this person's name is Chang Wuxi, obsessed with alchemy, and even delayed his cultivation, and Danshu is also a leader among the younger generation.

The Qingtian Sanren above seemed to have heard of Chang Wu's name, nodded at him, and asked, "What's the problem?" ”

Chang Wuzhi said: "I have a lot of pills, and the refining of pills has also been successful, after countless attempts, I can no longer be familiar with the refining method, but why is the success rate still not high, and it has been hovering between two and three percent?" ”

Qingtian Sanren on the stage smiled and said, "Being able to ask such a question, it seems that you haven't learned the Danshu in vain over the years, and you are really attentive." To refine the elixir, the first thing you need is the formula, the level of the elixir is different, the formula is also different, the higher the level of the elixir, the more complex the formula, the more difficult it is to understand. For example, the Qi Nourishing Pill taken in the Kaimai Realm and the Qi Gathering Pill taken during the Qi refining period, these two pills have their own requirements for the type, dosage, year, number of auxiliary drugs, addition time, heat, refining method, etc., you should be very clear about these, right? ”

Chang Wuxian nodded and said, "It's all clear." ”

Qingtian Sandao: "Many people have the same doubts as you, since you have the formula and know how to refine it, why is the probability of failure still so high?" Actually, that's the elixir I'm going to tell you about. The formula only gives the standard configuration of various medicinal materials, but in fact, the medicinal materials are not as standard as the formula is labeled. For example, the centennial elixir may have grown for one hundred and two years, or it may have grown for ninety-nine years and a few months, and the subtle differences cannot be seen, but the medicinal power is different; In the same way, even a standard hundred-year-old elixir may grow in the dense forests in the east, in the mountains in the west, in the swamps and puddles in the south, or in the deserts in the north, and regional differences can also affect the medicinal power; Even if it is the same year and the same region, it may grow in a different environment, perhaps in a more barren place on dry land, or in a more fertile place. If you subdivide it further, there is also the age of its growth, some of which suffered more from nature when they were growing, and some of which grew peacefully for so many years; There are also differences in picking methods, different ways of blooming, different storage times, different losses of medicinal power......, etc., etc.

Chang Wuxian fell into deep thought, Qingyang nodded secretly as he listened below, this Qingtian Sanren is worthy of being the chief alchemist of Qingfeng Palace, just the factors that affect the medicinal power, he can say so much casually.

Kiyota Sanren on the stage didn't care what the people below thought, he continued: "Since there are so many external conditions, of course, the medicinal power contained in each elixir is also different. The difference is a thousand miles, each elixir is slightly different from the formula, can there be no difference in the elixir that is finally combined together? Can the success rate of the pills that come out be high? These are not things that can be marked on the formula, but this really affects the quality of the pill, and many people don't know this reason, so refining the pill always fails. ”

Chang Wuxian said thoughtfully: "A slight difference in medicinal power may affect the effect of Cheng Dan, and the difference between countless kinds of elixirs accumulates to make the impact too great." In this way, the Dan Fang is not of much use to us Dan Masters, it is just a reference, and to refine a furnace of Dan Medicine is equivalent to reorganizing the entire Dan Fang. ”