Nie Fei picked up the fire in his palm, and after only heating it for a while, the two solutions reacted. The two originally layered solutions were finally mixed together and turned into a bright green looking solution.

At this time, a flash of light flashed in Nie Fei's mind, and he seemed to vaguely grasp the key to the problem. "Could it be that we have to wait for the two solutions to react before adding the snow bamboo leaves? In other words, the refining of this Yangyan Pill requires the reaction of two herbs before adding the other?

In Nie Fei's mind, after adding the snow bamboo leaf solution, this bright green solution would definitely react again. However, when he added snow bamboo leaves to it, it was not as he imagined, and the two solutions could not be mixed together anyway.

"What's going on? Could it be that my guess just now was completely wrong?" Nie Fei originally thought that these three herbs, plus Bai Qingshi, these four substances, were to first make the amorous flower and fig react, and then add snow bamboo leaves, and after the reaction again, add Bai Qingshi, and after the reaction, what was obtained was the active ingredient of Yangyan Dan.

Originally, this first step, after the amorous flower and fig were mixed, did react, which verified Nie Fei's idea, he did it right. However, the snow bamboo leaf solution added next couldn't react no matter what, and Nie Fei's guess was completely denied at once. At this point, the experiment came to an abrupt end, and the remaining white light stone didn't need to be added at all, because it was meaningless.

Looking at the solution that was orderly and did not react at all, Nie Fei really didn't know what to do next. He had tried several methods and thought a lot, but in the end, every conjecture was proved wrong by experiments.

"In the end, where is the right way?" Nie Fei shouted in his heart. He turned his gaze to the white light stone powder that had not yet been added to the solution. Suddenly, his eyes lit up, "Hey, it's a little strange, this white light stone doesn't seem to have decreased." ”

These white light stone powders are all recovered from the original gelatinous substance. The reason why Nie Fei felt strange was because he found that those white light stone powders had not decreased from when he first added them.

This is very strange, logically speaking, the gelatinous substance is the product of the reaction, although Nie Fei doesn't know what the gelatinous substance is, but this is completely certain. Nie Fei's strange thing was why the white light stone was added, and after the reaction occurred, the amount did not decrease.

Then there is only one explanation, that is, this white light stone is not involved in the reaction, that is to say, the substance of white light stone, in the formula of Yangyan Dan, is a useless thing at all.

Is this possible? Nie Fei thought about it and felt that this truth didn't make sense, although Nie Fei didn't know who wrote it, but with such a big loophole, it should be impossible to save it. Besides, even if you want to write something useless, why choose white light stone?

Nie Fei hypothesized that this white light stone was useful, but this effect, Nie Fei didn't know for the time being, and it could be assumed that this white light stone was also involved in the reaction. So, what reaction is involved, and after the reaction, the amount does not decrease?

Nie Fei took a deep breath, he thought of it. In chemical reactions, the substances that participate in the reaction but do not change in content are stored in zài, that is, catalysts. Catalysts can speed up reactions and are very important substances. In many reactions, catalysts are essential substances, without which these reactions simply cannot be completed.

Nie Fei was so nervous that his breathing was a little short, he didn't dare to think and had to think, "Could it be that this white light stone is a catalyst?" This is not impossible, in his previous life, most of the organic reactions had to be completed by adding catalysts. Thinking about it this way, it is not impossible to add a catalyst to speed up the reaction in alchemy.

"If this reasoning is correct," Nie Fei thought, "it's just that I don't know if the catalyst was the person who made the zuò Danfang, and he intentionally joined it, or if he added it by chance or by random attempt." If it was really intentionally added, then the scientific level of this immortal cultivation world did not seem to be as low as he thought. ”

Now, there is a new problem, that is, if this white light stone is really a catalyst, then which reaction is catalyzed by white light stone? The first reaction, that is, the reaction of amorous flowers and figs, does not need white light stone to catalyze at all, because without the catalysis of white light stone, that reaction also happens. According to Nie Fei's inference, the amorous flower and the fig react to obtain a new substance, which has to react with the snow bamboo leaves. This reaction, Nie Fei has already tried, and he can't go on at all.

"It seems that this white light stone catalyzed this reaction. ”

......

Nie Fei took a deep breath and added the white light stone powder to the solution. The white light stone powder, like a white snow in the solution, slowly sank to the bottom of the solution.

At this time, the solution still did not have any reaction, but Nie Fei was not anxious at all, and it was normal that there was no reaction.

Nie Fei picked up the fire in his palm and began to warm the solution. Finally, when the temperature rose to about 50 degrees, a miracle occurred, the two solutions that had not reacted before suddenly merged together, and the color of the two solutions also changed sharply, the bright green gradually decreased, and the purple gradually increased.

Nie Fei maintained this temperature until half an hour, and he observed that the color of the solution did not change anymore, and knew that the reaction was almost complete.

The jade cup was still for nearly an hour, and Nie Fei looked at the bright purple solution in the jade cup. "This is the active ingredient of the beauty pill, it seems that the white light stone is indeed used as a catalyst and exists. ”

According to the general steps, next, you only need to evaporate the water in it, and the remaining substance is made into a pill, which is the beauty pill. However, Nie Fei had one more thought at this time.

He finally knew why all the alchemists said that it was difficult to refine the Yangyan Pill. Obviously, according to the normal alchemy method, all the herbs are put together, and it is impossible to refine the beauty pill no matter what. And the alchemy in this world is precisely this method of putting all the herbs together. If this can be refined to make a beauty pill, it would be a strange thing.

However, this is only to say that the vast majority, and there may be a very small number of people who have adopted the correct method to refine the beauty pill. It's not impossible, so many alchemists, it's not surprising that a few have found this correct method. Then, the beauty pill that Nie Fei refined this time was the same as everyone else's, with the same effect, and there was nothing special about it.

For this situation, Nie Fei was completely intolerable, he thought to himself: I have mastered a method that exceeds the world level, if I want to practice, I must refine the best, otherwise, how can I appear to be superior.