In fact, this is the first natural dansha (mercury sulfide) to be refined into mercury, and then the mercury and sulfur are mixed and placed in a closed tripod to be refined into pure mercury sulfide, and the mercury sulfide is placed in a closed tripod (adding lead or other drugs) and then refined into mercury, and the mercury is then refined into dansha (mercury sulfide), and then the dansha is refined into mercury, and the mercury is refined into dansha, and so on many times, and finally it is refined into a "fairy medicine". Pen ~ Fun ~ Pavilion www.biquge.info to the Tang Dynasty alchemist's refining skills, you can do seven to nine returns, and mercury is not lacking. This is actually a very delicate solid chemical reaction, and it is not easy to achieve quantitative transformation today. It should be pointed out that the modern law of conservation of matter is established by smelting ** in a closed container, decomposing ** into oxygen and mercury, re-synthesizing **, and accurately weighing whether there is any change in its weight. This is similar to the ancient Chinese alchemy experiments, one using sulfur and mercury, and the other using oxygen and mercury. From this, it can be seen that as early as the Tang Dynasty, alchemists had initially established the idea of conservation.

Furthermore, the Tang Dynasty alchemist Jin Lingzi recorded in a book that in addition to refining dansha, arsenic was also refined, and arsenic was reduced to arsenic with carbon and copper to form a silvery-white "Danyang silver" (arsenic white copper). And the most ingenious of them is his experiment of refining red silver with bile water. The process is to dissolve the bile alum (copper sulfate) in water, put it in the iron kettle, and put mercury in the iron kettle, then heat and constantly stir the liquid, and slowly the mercury will form "sand" (in fact, the pot iron replaces the copper in the copper sulfate, and the copper and mercury form a solidified copper amalgam), and the "sand" is placed in the Danding to be refined, and the mercury can be recovered (no shortage of millimeters), and red silver (pure copper) is obtained at the same time.

What is even more admirable is that Jin Lingzi weighed the weight of mercury, red silver, and iron pot before and after the reaction. He pointed out that the weight of red silver is equivalent to the weight minus from an iron pot, so the red silver comes from an iron pot. At that time, he had just not studied the changes in the copper sulphate solution before and after the reaction. But using the weighing method to explore the nature of the chemical change process should be the greatest experiment in the history of alchemy. His experiment is actually a validation and further exploration of the principle of conservation of matter.

The most important contribution of the Chinese alchemists was made in the accident of failure. That is, the medicine that will catch fire and explode? -Gunpowder. The main raw materials of gunpowder: saltpeter and sulfur have been the main medicines used by alchemists since the Han Dynasty. In the Eastern Han Dynasty, Wei Boyang had already pointed out that during alchemy, "if the medicine is not of the same species, the division is uneven, and the discipline is lost," it will "fly turtles and snakes, and become more and more perverse". This is exactly what is recorded about the explosion phenomenon in alchemy. Later, during the Three Kingdoms period, Hao Zhao defended Chen Cangcheng and repelled Zhuge Liang's attack with "fire shooting stones" (see Li Daoyuan's "Notes on the Water Classic"). This is probably the earliest record of defensive firearms using gunpowder. In the "Chronicles of the Nine Kingdoms", it is recorded that in the early years of Tianyou of Tang Aizong (904), Zheng Yan attacked Yuzhang, "using the department to start flying fire and burning Longshamen", which is the earliest record of offensive firearms.

In the Song Dynasty, there were official gunpowder workshops to manufacture gunpowder for military use, and at the same time, the gunpowder formula was not kept secret, and it was used to make various pyrotechnics among the people, and there were specialty stores in the Southern Song Dynasty. How to develop from pyrotechnics to modern rockets will be described in a separate section. Gunpowder spread to the West around the Yuan Dynasty and became one of the four great inventions that brought about world change. ----introduction

It is in the center of a lake in the hinterland of Yingyan Spring.

"It's a demon."

"He's a demon."

Among the thousands of disciples, many were still shouting in terror.

"You're a demon?"

Jia hypocrisy stared at the wind, his evil magic weapon was only a half-finished product after all, and this time it was forced to be interrupted because of the wind, just with that half-finished magic weapon, Jia hypocrisy was also considered the top in the demon level, but according to what he heard his disciples discuss, this wind was only an eleven or twelve-year-old "boy" in the silver series at most.

Is an eleven or twelve-year-old boy a demon? (fifteen years old at most) if it is! Jia hypocrisy is jealous, I am afraid that there will be adventures when he becomes a demon at such a young age, maybe there will be some hole card tricks.

"Demon? I'm not a demon, can you believe it? ”

Wind cold voice.

Sou!

Jia Hypocrisy, who was originally standing there, suddenly appeared under his feet, and the pedal boat flew into the distance in an instant, and the wind widened the distance.

Jia Hypocrisy, who was dressed in a black robe, looked at Feng coldly, he had already regarded Feng as an equal opponent, so he distanced himself from the beginning.

Martial cultivators or capable people are also divided into different categories, like some gods and demons who refine the body flow prefer melee combat, while other manipulating magic weapons, poisons, puppets, etc. like to distance themselves and then use their means, after all, it is dangerous to get too close.

Like Jia hypocrisy, he likes to use poisons and magic weapons.

"Bang."

A black paw strikes the wind from behind.

The wings of the wind shook and crossed an arc and immediately avoided it, and the strong wind generated by the black claws tore the ground apart, and the black-haired zombies roared and chased the wind.

"Jia hypocrisy, suffer death!"

While the wind was dodging the black-haired zombies, more than four hundred sword weapons appeared around him, and a sword weapon suddenly produced a white light under the control of the wind.

"Sure enough, there is no need to force it at all, you just need to take advantage of the situation. Lead the key points of this large-scale "Tiangang Thirty-six Sword Array" ......"

Feng had searched for the Enlightenment Formation in the memory that Yinshu had left him before, and he had never tried the 'Tiangang Thirty-six Sword Formation' well, although he had used it in the imaginary practice, it was too difficult.

At this moment, the wind is obviously much more relaxed, and in the continuous testing of the wind, the four hundred and five sword weapons are becoming more and more agile, and the wind is more and more easy to control.

"Magic weapon?!" Jia Hypocrite, who was stepping on the boat in the distance, changed his face when he saw this, "He can actually control the magic weapon to fly, and it is really a demon level!" So many sword weapons...... It is estimated that almost all of them are non-level magic weapons, but the combined power of so many non-level magic weapons must be not small. ”

"Roar~~~"

The roaring black-haired zombie is chasing the wind, chasing and killing again and again.

Feng is extremely flexible with his super divine aerial technique, avoiding it again and again, and he must make better use of his advantages in life and death fighting.

The black-haired zombie looks infinitely powerful and indestructible, and it is stupid to fight with it......

Feng naturally understands that this black-haired zombie is probably raised by Jia hypocrite, as long as Jia hypocrisy is killed, the black-haired zombie will not be afraid.

"Large Tiangang Thirty-six Sword Formation."

Feng constantly controlled the large number of sword weapons suspended around him, and quickly became familiar with the subtleties of the Tiangang Thirty-six Sword Formation, making it easier for him to control.

"Go!" Feng suddenly had a sharp glint in his eyes, and he looked at Jia hypocrisy in the distance.

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