In anxiety, Nie Fei waited for half an hour. This half an hour, in Nie Fei's feelings, was really longer than half a year. As soon as half an hour arrived, Nie Fei immediately rushed to the jade cup. At this time, his mood was impatient, but the more he reached this time, the more calm his hand became, and he would never let the liquid in the cup vibrate because of his own movement.

At the moment when the jade cup was raised in front of him, Nie Fei found that this time, the liquid in the cup finally produced a gratifying change. The liquid in the cup is still divided into two layers. The previous layer is still vegetable oil, but this time the green color in the vegetable oil has become darker, turning into a dark green, and there is a faint black gas in it. On the lower level is the Tianyan Spring, which was originally transparent, but now it has turned white, only half transparent. From this, it can be seen that something must have melted into the water. If you look closely, you will find that there is a mist flowing in the spring from time to time, as if the clouds in the sky are melting into the water, ethereal and constantly changing.

Seeing this scene, Nie Fei couldn't help but breathe a sigh of relief, it seemed that this time it was a success. But whether the dissolution in the Tianyan Spring Water below is Xie Lingcao's immortal nature, it is not possible to make a conclusion at this moment, and it must be verified by facts.

First of all, try to take out the water from the Tianyan Spring. Tianyan Spring Water is located on the lower level, and if you want to take out the Tianyan Spring Water without being contaminated with a little vegetable oil from the upper layer, it may be an impossible thing in the eyes of others, but for Nie Fei, it is the most ordinary thing. The method is very simple, that is, to use a funnel to achieve oil-water separation, which he has done hundreds of times in the previous real room.

He found a jade cup, managed to drill a small hole in the bottom, plugged it with a stopper, and poured all the liquid into the cup. Half an hour later, when the oil and water were completely separated, Nie Fei picked up the cup and pulled the stopper from the bottom. So, like a thin thread, the water from the lower heavenly eye spring flowed out of the cup and flowed into the next clean cup.

When the water from Tianyan Spring flowed clean, Nie Fei hurriedly plugged the plug again. The remaining vegetable oil in the cup is very likely to contain highly poisonous, and Nie Fei does not dare to discard it casually, otherwise he may kill many people. As for how to deal with it, Nie Fei didn't think about it, so he saved it first.

Now, all of Nie Fei's attention was focused on the half cup of Tianyan Spring water flowing out. "Is it true that inside this spring, as I expected, Xie Lingcao is a substance with spiritual energy?" Nie Fei supported his chin with both hands, and his two eyes stared at the spring in front of him without blinking. Suddenly, he straightened up and clapped his palms, "What's the use of me thinking about it here?

Nie Fei got up and went to catch some small animals, from moths and beetles to rats and frogs. Even at the end, he caught a hedgehog and a hare. He had only one purpose in catching these animals, and that was to use them to test whether the spring water was poisonous. Of course, it is better not to be poisonous, if the spring water is poisonous, these animals, which are real yàn, will definitely be difficult to live, which is equivalent to killing many living beings, which makes Nie Fei's heart slightly unbearable. But as soon as he thought that this reality was related to a major event that had never been seen in the immortal cultivation world since ancient times, he thought that these animals were fortunate enough to participate in this matter, and it could be regarded as their creation, even if they lost their lives, they would not be wronged. After thinking about it like this, Nie Fei's heart was a little better.

He dipped a thin wooden stick in the spring water, and brought out a few drops of liquid, one on each of the heads of the moths and beetles. This drop of spring water, although not very much, is enough to completely infiltrate the heads of those small insects. After a long time, the moths and beetles did not die, and after flapping their wings a few times, they flew away one by one.

"It shouldn't be poisonous, right?" Nie Fei was still not very relieved, and broke open the mouths of the frogs and rats, and poured a few drops of spring water into their mouths. "You should be dead now, right?" he said to himself, but in his heart, he didn't want them to die at all. To his delight, the frog and the mouse did not die as he had said, but after drinking the water, they were very lively, and they were full of vitality when they jumped, and they left one by one. Nie Fei's eyes were full of excitement, and suddenly, he turned his head and said with a smile to the frightened hedgehog and rabbit, "This time, it's your turn." ”

This time, he poured a large mouthful of spring water on the hedgehog and the rabbit, and even if the spring water was only slightly poisonous, such a large mouthful of spring water could poison the two animals to death.

As soon as he let go of the two animals and put them on the ground, and was about to observe what had changed in them, the hedgehog and the rabbit, like clockwork machines, each ran away with an afterimage, and in a moment they were gone.

Nie Fei was stunned, then laughed, not unhappy because of the escape of the two animals, "They're fine...... They're fine......"

Now, it's almost certain that the water is non-toxic. Now only the final and most critical step remains, human trials. At this step, Nie Fei decided to go into battle in person, only in this way could he determine whether this spring water was poisonous or not. In fact, this is secondary, because by this time it is certain that the spring water is non-toxic, and even if it is poisonous, it is very intoxicating. The most important thing is that only when he experiences it himself can he tell whether there is any immortal nature of Xie Lingcao in this spring water, or just ordinary Tianyan spring water.

For safety, he didn't dare to drink more, just drank a few drops.

As soon as these drops of spring water entered his mouth, before he could swallow them, a fresh aura had already steamed out of the spring water. Nie Fei hurriedly sat down cross-legged, closed his eyes, and picked up the immortal exercises. It took several rounds of longevity to absorb the spiritual energy in the spring water, and all of it was summed up in the sea of qi.

He opened his eyes again and clicked his mouth, taking in the sensation he had just felt. In this spring, in addition to the aura that was absorbed into the sea of qi just now, there is also a trace of aura, which cannot be absorbed into the sea of qi, and after entering the meridians of the body, it only wanders around in the meridians. Nie Fei thought about it for a while and felt that this trace of aura should be the aura carried in the spring water. It is no wonder that this spring water can only play a role in replenishing the aura, but not to help cultivation, the original aura in the spring water cannot be absorbed into the sea of qi, and the aura that cannot be absorbed into the sea of qi is impossible for immortal cultivators to have.