Smoke continued to emerge from the mouth of the jade bottle, and after a quarter of an hour, the smoke gradually thinned out, until finally, there was no trace of smoke. Nie Fei knew that the reaction was complete. Generally speaking, an indicator is used in an acid-base titration reaction like this, and the color of the solution changes to observe whether the reaction is complete. But this time the situation was special, not to mention that there was nowhere to get the indicator, Nie Fei couldn't even figure out what the reaction was, so he could only judge the end point of the reaction from the smoke.

The reaction is that the reaction is over, but after the reaction, what is left? Nie Fei couldn't judge. Nie Fei couldn't help but assume, assuming that this reality was true, using acid and alkali, it was possible to separate the cold and yang qi from the sunflower, but it was not easy to judge whether the remaining cold qi and yang qi from the sunflower were the cold part of the sunflower or the yang part. "No, it can't be said that it is difficult to judge, it should be more appropriate to say that there is no way to judge. Nie Fei thought to himself.

The jade bottle that had finished the reaction was placed on the table, and Nie Fei stared at it for a long time, but there was still no way. "It's not a way to keep staring like this. Thinking of this, Nie Fei grabbed the jade bottle in his hand with a copy of his hand.

He grabbed the jade bottle in his hand, and suddenly felt a chill coming out of the jade bottle, as if the jade bottle had turned into a piece of ice. Nie Fei didn't expect that the jade bottle would have such a change, and he was caught off guard, and he almost didn't hold it, and the jade bottle almost fell off his palm and fell to the ground. Fortunately, he reacted quickly, and his palm tightened, and he grabbed the jade bottle again.

This change in the jade bottle made Nie Fei overjoyed. He immediately observed the changes in the jade bottle, and this look really saw some clues. I saw that the outside of the jade bottle, in this short period of time, had condensed a layer of frost, and there was even a trace of cold air, ethereal at the mouth of the jade bottle. Moreover, he also saw that the solution in the jade bottle had completely turned black at this time, blacker than ink, and there was no trace of the original red in it.

"It seems that the dark red smoke is the original red in the solution. ”

From these phenomena, Nie Fei could judge that after the alkali reaction, some things in the jade bottle were missing, and it could also be said that the addition of alkali did cause the separation of the solution. The temperature of the solution left in the bottle must be extremely low, otherwise, it is impossible to condense a layer of frost on the outer wall of the jade bottle.

Although the temperature of the solution is extremely low and has the attribute of cold, it is still impossible to judge according to this, who can guarantee that the solution with a very low temperature must contain cold gas?

Nie Fei thought about it for a long time, trying to find a way to tell whether the liquid in the jade bottle was cold or not. But in the end, he couldn't think of a safe and effective way. Nie Fei looked at the jade bottle in his hand, and his eyes suddenly became firm. "It seems that this last method has to be used. "Nie Fei's last method, that is, he wants to try it himself, after incorporating the liquid into his abdomen, he will absorb it into the sea of qi through guò longevity. In this way, it is possible to immediately distinguish whether the liquid is yin or yang.

However, Nie Fei also knew that it was best not to swallow such an unknown substance casually. But in the end, Nie Fei still made up his mind to swallow the liquid. He thought about it this way, and in that "Hundred Herbs Illustrated Book", he clearly said that there is no other substance in the sunflower containing cold and yang energy. And this cold and yang energy will not cause damage to the body. He swallowed the liquid, which seemed to be taking a great risk, but in fact, after careful analysis, there should be no danger.

Thinking of this, Nie Fei no longer doubted, brought the jade bottle to his mouth, tilted slightly, and a small mouthful of cold liquid flowed into his mouth, down his throat, and into his abdomen.

Nie Fei didn't dare to drink more, just a small sip. Even if it's a small bite, you should be able to tell the difference.

......

Nie Fei had already considered all the possibilities, and then he took this small sip. Unbeknownst to him, this small mouthful of liquid only entered the abdomen, and it changed.

He felt that after the liquid flowed into his abdomen, it was as if he had swallowed a piece of ice, from his throat to his abdomen, as if he had been frozen in an instant. He didn't think it was too cold at first, but it only took a few moments for his body temperature to iron the liquid up. Who knows, the chill is getting worse and worse, and only a moment later, the chill seems to leak out from the inside out, freezing Nie Fei's entire body.

Nie Fei couldn't stand this chill, and couldn't help but clasp his hands in front of his chest, but his body still felt a burst of cold, just like in the winter, he took off his clothes and stood in the ice and snow. Nie Fei's body trembled, bent down, and his legs did not obey the call, and fell to the ground. At this time, he did not know that his face had turned a terrible pale, especially his lips, which were even more terrifyingly pale, and on both sides of his cheeks, frost had gradually condensed, and the frost was still spreading rapidly, and in less time the whole face was covered with frost.

Nie Fei felt as if his body had been frozen into a stone. "I ...... Am I going to freeze to death?" This freezing cold is so cold that even the brain seems to be frozen, and the thinking becomes extremely sluggish. Nie Fei vaguely realized that it was impossible to rely on body temperature to alleviate this cold qi, so he had to use the absorption technique to try it, hoping that this cold qi would be absorbed into the sea of qi. As for whether this liquid from the sunflower is cold or positive, Nie Fei can't take care of these at this moment.

Just as Nie Fei was about to lose consciousness, he finally took the immortal skill in front of him. Changshenggong drove the aura to flow slowly, and as soon as the aura passed through the abdomen, the cold qi invaded it, and when it landed, the aura seemed to be frozen, and it no longer flowed.

Nie Fei smiled bitterly in his heart, "This cold air...... It's so domineering, it doesn't even work with aura. "His mind was already very dull under the effect of the cold air, and he couldn't even use the immortal skill at the moment, so he really couldn't think of another way.

In fact, Nie Fei didn't know that the reason why he was in this situation was that he was still drinking too much liquid. As described in the "Hundred Herbs Illustrated", the sunflower is cold and masculine coexist, but the cold is more, therefore, this sunflower belongs to the cold nature, which is a kind of herb for immortal cultivators to enhance the coldness of the aura. Under normal circumstances, even if an immortal cultivator eats a whole sunflower, he may not see anything wrong, just because most of the cold qi in the sunflower has been neutralized by yang energy, and the rest is very small, which is not enough to cause danger to the immortal cultivator.