Taoist alchemy, there are [Inner Dan] and [Outer Dan].

This Inner Dan is naturally "reconciling the dragon and tiger" and "catching and filling in the gaps", until [a golden pill is swallowed into the abdomen], refining the Inner Dan, you will be regarded as an immortal, and it is a Taoist true immortal!

As for Waidan, the fundamental theory is the same as that of Neidan, but the name has been changed, to "burn lead and hit mercury", "blend dragon and tiger" and so on.

However, although the fundamental theory is the same, as an independent system, Waidan naturally does not follow the usual path:

To refine the Wai Dan, you need to use all kinds of Dan materials, including but not limited to grass and wood materials, beast materials, ore materials, and some crazy Wai Dan masters even use people to refine the Dan!

Especially the [Jindan] in the Waidan, this thing really wants to be refined with metals, such as lead, mercury and a series of highly toxic heavy metals.

These people eat Jin Dan indiscriminately, and eat this thing that was originally used by Taoist cultivators as food, but they don't count eating themselves to death, and they also stigmatize Jin Dan, causing later generations to scold the ancients for being as stupid as pigs and eating heavy metals......

In fact, the Jin Dan is the pinnacle of the Wai Dan Dao, to refine a real Jin Dan, I don't know how much effort it takes, where is the pills that the swaggering magicians rubbed out with heavy metal!

……

Although Zhang Ran has only a preliminary understanding of Taoism, the tutor is too awesome, and the Taoist ancestor personally taught, coupled with Zhang Ran's good Dan skills, this study abroad in another world is really very rewarding.

Even he dared to take Jin Dan directly!

"This Dragon and Tiger Jindan is not so anti-human, no lead and mercury, only gold, with the medicinal essence I deleted, this time [Cat and Snake Jindan] can be achieved!"

Zhang Ran thought about it, so he took out a piece of gold from the red envelope that he had obtained from the last time he entered the ancient tomb.

"No fire has a few thousand degrees, and it can't burn gold, but I'm a spiritual fire......

Zhang Ran put this piece of gold into the furnace, except for occasionally adding some spiritual essence to help burn, and did not add other Dan materials.

After doing all this, Zhang Ran sat down easily and waited for Huang to financialize:

"When the fire refines gold, it only changes its physical state, and it does not fundamentally change it into the [gold] used in alchemy, which is also the reason why there is no real gold pill in the [Three Kingdoms] world."

According to the theory, this fire must be a spiritual fire or immortal fire that can transform gold into [gold] used in alchemy.

He used either the "Liuding Divine Fire" or the "Samadhi True Fire", and the reason why he used them for alchemy was precisely because only these immortal fires could fundamentally change the nature of the Dan materials......

(Ahem, the above is all scribbled by the author, don't think about eating Jindan, we are mortals, and we can't digest it...... (?°??? °)?)

……

Next, one word:

Wait!

When the gold is refined into a dan embryo by the spiritual fire......

The waiting time is very long, Zhang Ran is not panicking, he took half a month off, isn't it just for alchemy?

However, this alchemy also has to be relaxed, refining gold is not an overnight thing, and Zhang Ran does not have to stay by the Dan furnace at all times.

Zhang Ran even put the Dan furnace in the courtyard to practice, and he was bored, except for most of the time when he cultivated the Yuan Shen, he also went to the long-lost medical hall every day to see how the apprentices were doing, and by the way, he taught some Danshu theories.

He was very satisfied with the results of the inspection, the seven apprentices not only took over the work of treating diseases and saving people perfectly, but also gradually sharpened and grew in practice, according to the standards of the world, they can all be regarded as famous doctors in a county!

"It seems that it will not be long before we can consider letting them go out of the school and travel to other countries."

Zhang Ran looked at the apprentices who were skilled in diagnosing people, and the idea in his heart gradually became clear:

The disciple became a famous doctor, and then formed a medical force, so that the disciples and grandchildren could scatter the world and worship themselves as their ancestors, not only could they collect pills for him to enrich the medicine library, but also become a large force across states and counties!

Although he didn't expect a group of doctors to help him rebel, he might be able to use this power in the future......

In this way, Zhang Ran happily inspected and pointed out some knowledge points about Dan Dao to the apprentices, and came to give them formal lessons every day.

came and went, as if he hadn't refined any dragon and tiger golden pills at all......

In addition to teaching apprentices, Zhang Ran will also feed the tiger and green snake with spirit spirits every day.

These two guys have no aroma support, and the huge appetite of the monsters is reflected, if it weren't for Zhang Ran feeding the spirit spirits every day, I'm afraid that he would have been so hungry that his eyes were green, and he would have run out of the city to hunt!

Eating the spirit precision day is commonplace for tigers, but for green snakes, it is flattered.

In her life, she has only seen and heard of the spirit spirits, but if she really wants to eat it, it is indeed the first time that a snake is born!

So, on the first day of eating the spirit spirit, unlike the tiger's calm licking, the green snake solemnly changed its human body.

She first used a white porcelain bowl to hold two small spoonfuls, then used warm boiled water to dissolve the spirit essence, and finally drank slowly and methodically with a spoon and scooped it, and with each sip, she had to close her eyes and taste it carefully, and the expression on her face was very happy......

Good guy, what about putting this pretending to be a lady?

This scene not only looked stupid Zhang Ran, but also looked stupid with the tiger:

This king is really a wild monster with no life grade!

Looking at the green snake's behavior, the tiger couldn't help but feel ashamed......

On this day, Ah Qing brewed a bowl of spiritual essence water again, holding it in one hand and tasting it slowly with a spoon in the other.

She pursed her lips, glanced at Zhang Ran, who was sitting at the door to prepare medicinal essences, and said suspiciously:

"Daoist Zhang, your lump of gold has been refined for seven or eight days, haven't you refined it yet?"

Although she doesn't know the Danshu, how can she look at this kind of operation of just putting a lump of gold in the furnace to refine it......

"It's been refined a long time ago."

To Ah Qing's surprise, Zhang Ran said this nonchalantly.

"Huh?"

Ah Qing was stunned, and his right hand, which was scooping the spiritual essence water, paused:

"Then why didn't you finish work earlier? ...... so long"

"Huh! You know what! ”

Zhang Ran sneered:

"Ordinary pills naturally have no taboos, but if you refine Bao Dan, you must pay attention to the right time, place and people, even if there is a little bit of difference, it is possible that the pill will be destroyed and even killed!"

"In the past, there was a Dan master named [Tang Seng], he used the spirit monkey of heaven and earth as the pill material, intending to refine a furnace of magic medicine, and opened the furnace when the time was not enough to refine ninety-nine eighty-one days, and actually let the spirit monkey escape, and finally was killed by the spirit monkey with a stick......"

"Heaven Descends"

Ah Qing was stunned by his nonsense:

It turns out that there is still this truth, this Dan Dao is too complicated, right......

Seeing that he was bluffing Ah Qing, Zhang Ran didn't care about her, but peeked at a corner of the courtyard, where the county commander Yuan Shen was hiding from peeping.

"It seems that the old leader was bluffed......"

Zhang Ran secretly breathed a sigh of relief, what was the county order Yuan Shen here for, he knew it, and it wasn't because he was hanging around outside all day long that this aroused the suspicion of the county order:

Didn't you kid ask for leave to alchemy? How can you still have the leisure to come out and play every day?

Cough!

Zhang Ran said in his heart:

Serious people ask for leave, who doesn't ask for a few more days!

It's just a castrated version of the Jin Dan, and it's not the full version of the Dragon and Tiger Jin Dan, at best, it will be over in three or five days, and the extra time is deliberately dragged out to play......

"Well, after refining for seven days, the time is ready, and today is the time to become a Dan!"

Zhang Ran stood up solemnly, holding a large bowl of medicinal essence that had been prepared in his arms, and slowly approached the scorching Dan furnace.

Open the lid and the heat is rising!

Zhang Ran looked at one of them from afar:

There was no flame in the furnace, not even too hot, at least not a few thousand degrees Celsius.

But the lump of gold has completely melted, and the gold accumulated at the bottom of the furnace is shining, and it is very beautiful!

"The Dan embryo has been completed, it's time to get the Dan!"

Zhang Ran gently poured the bowl of medicinal essence into the gold liquid in the furnace, and then took out a few bowls of pre-adjusted essence and put them in batches and in order.

And the gold liquid did not burn these medicinal essences, but strangely fused them, the more they fused, the more the gold liquid solidified, and after the last essence was fused, it coagulated into a solid lump again.

Zhang Ran closed the lid of the furnace, his face became more and more solemn, and the alchemy process was about to reach the last step:

"Yin and Yang refining form, Yang Dragon Yin Tiger ......"

Just a few seconds after the fried-up lid was closed, a strange change occurred in the furnace, and the black and white breath seeped out of the furnace.

Yin black and yang white, this oozing yin and yang two qi surround the Dan furnace, half black, half white, with the Dan furnace as the center, forming a "Tai Chi" vision......

Click!

The lid of the furnace turned on its own, and a cloud of golden light burst out in an instant, and after the golden light and the Tai Chi vision subsided, it showed its true face:

Two soybean-sized golden pills were suspended in the furnace out of thin air!

Dragon Tiger ...... Oh, cat snake Jindan, out of the oven!