Longan is playing a simple chemistry trick. The ball is actually very ordinary, but it is just a pill used in the mortal world to repel insects and prevent moths, but it is easy to volatilize and has a very low ignition point. When the fire was lit, all that really burned was the ball, and the handkerchief wrapped around it was unscathed.

Speaking of which, this truth is not much different from paper hot pot. As long as the water in the pot is not dry, no matter how it is heated with an open flame below, the pot will not exceed the boiling point temperature of the water, and the paper will not burn.

In the past world, chemistry teachers would often demonstrate a few of these simple experiments to attract children's interest. However, the indigenous alchemist Mao Chongwu obviously didn't understand the principle, and was really shocked.

As a disciple of the outer sect of the lower court, Mao Chongwu did not come into contact with many magic weapons, but he at least knew that those who could extinguish fire, even if it was just ordinary fire, must be of extraordinary value. After verifying it twice, he still couldn't hide his surprise, holding the ball and looking at it again, "It's really strange and strange, what kind of treasure is this, it doesn't need to consume spiritual energy to protect this handkerchief from being burned." ”

Gui Yuan said according to the pretext he had thought of in advance: "This is what I read from ancient books, and I didn't believe it at first, but after trying it, I found that there was indeed something strange. The book also contains some artifacts that are useful for alchemy. I found a way to try out some of them, and asked Senior Brother Mao to help verify one or two. ”

Mao Chongwu saw the magic of the things that Gui Yuan took out, and his attitude eased a lot, but he still had his own insistence on Dan Dao, shook his head and said: "Although your fire pill is magical, it is a small way after all, if the utensils you said can assist in alchemy, why don't the ancestors use it." You need to know that Dan Dao is not a child's play, every step must not be wrong, and the rules cannot be messed up. ”

Gui Yuan said with a smile: "What Senior Brother said is very true, the word rules is the most important. Leaving Lou Zhiming, the ingenuity of the public losing the son, not according to the rules, can not be a square circle. Strange craftsmen like Lu Ban Lilou need to rely on tools to assist themselves, to plan the circle, to draw the square. And the auxiliary tools I'm talking about are exactly the rules and regulations of alchemy. The true immortal predecessors have magical immortal methods, and they don't need to use tools, our Taoism is slight, and it is more secure to rely on rules and regulations. ”

She saw that Mao Chongwu was a little roundabout, and she liked to act according to the book, and deliberately said a lot of specious truths to make him dizzy. Wang Dazhi, a good friend of the scandal, also pulled Senior Brother Mao and muttered for a long time, not knowing what to say, Senior Brother Mao finally nodded and agreed to let the little junior sister give it a try. He said with a straight face: "It's only this once, if it doesn't work, you must not mess around again in the future." ”

Gui Yuan confidently agreed: "Senior brother, there are three sets of Jiji furnaces here, I think they can be opened and refined at the same time." One of the furnaces is troublesome for the senior brother to refine normally, and the other two furnaces I will use the methods written in the book to assist, please increase or decrease the heat according to what I said, and the other techniques are the same as the usual alchemy. ”

Mao Zhongwu nodded and agreed, divided the medicinal materials into three parts and put them into the furnace separately, and then added the spiritual spring to raise the Danhuo.

Longan was carefully placed in two of the water furnaces, a palm-high object. Senior Brother Mao took a closer look, but it was two crystal clear crystal cups, which contained most of the red liquid, the mouth of the cup was sealed by something, and a hollow tube was also made of crystal, and many short lines were engraved on the wall of the tube from top to bottom.

The Dan liquid is getting hotter, and the gross weight is concentrated on observing the situation in the furnace, and adjusting the Dan fire with aura at any time, so as not to fall short. Gui Yuan also stared at the two crystal cups, and from time to time asked the gross weight five to increase or weaken the firepower.

During the Qi training period, the upper grade is naturally deaf and bright, and the induction is much higher than that of ordinary people, Mao Chongwu quickly noticed that there is a short line on the crystal tube in the cup that is deliberately dyed red, as the temperature rises, the liquid in the cup pours into the crystal tube, and when it almost reaches the red line, Longan will ask for a slight reduction in the Dan fire, if it is lower than the red line, it is to increase the firepower, in short, the height of the liquid in the tube is kept near the red line.

It didn't take long to refine the marrow washing liquid, after about a stick of incense, one of the furnaces of the pill liquid that Longan took care of had turned into a deep blue, exuding a fragrant fragrance, and the gross weight five knew that this was a sign that the power of ambergris herbs was completely stimulated and extracted, so far the most critical part of the marrow washing liquid had been completed, he didn't dare to delay, and hurriedly adjusted the Danhuo, added the remaining auxiliary medicinal materials, and completed the final step.

At this time, the other furnace of Dan liquid was also on the fire, and the color was about the same as the previous furnace, but the aroma was two points lighter. And the furnace he made himself was yellow-green and did not have much aroma.

The three furnaces of marrow washing liquid have been refined one after another, and it is really hard to believe the facts in front of them. The elixir that was refined with the help of strange crystal cups was of the highest grade, and the first furnace could even be called the best. And the furnace he refined himself could barely be regarded as a failure, although it was because of distraction, but it was indeed far from those two furnaces. What's more, he had only seen the immortal masters of the Danfang practice the spiritual liquid of the grade like the first furnace, and even when he was in the best condition, the marrow washing liquid he refined could only barely reach the level of the second furnace.

Mao Chongwu was stunned for a moment, paced back and forth in the Dan room a few times, put the two crystal cups on the case and looked at them carefully, and looked up to the sky bitterly, only to feel that everything he saw today was really weird, and it was really beyond his understanding.

The homemade thermometer of the soil method was indeed useful, and Longan was also relieved. According to Danfang's description, she estimated that ambergris had an optimal dissolution temperature. Extraction below this temperature is not sufficient, and too high will destroy the aura and medicinal power. It's just that Danfang and her predecessors' experience are very vague, and she can only try to control one furnace to 70 degrees, and the other to 75 degrees. Based on the results of today's experiment, it is clear that 75 degrees is more appropriate. She secretly noted down this conclusion and planned to do a few more experiments to get closer to the perfect value.

However, the top priority at the moment is to strike while the iron is hot to get Senior Brother Mao, and before she can speak, Osmanthus has already blinked and smiled: "It seems that the record in this ancient book is indeed valid, this is really an unexpected joy." Thank you, Brother Mao, for helping us verify. ”

Mao Chongwu said in a daze: "The ancient book is honest and I don't deceive, and I can't deceive it." Teacher, please, this artifact is a piece of fire that senses the heat of the Dan furnace? It's really magical! I don't know what it's called?"

Gui Yuan scratched his head, "This thing is called, well, the Nine Heavens of Ice and Fire." She casually picked up the one in the first furnace, "Judging from the situation of alchemy just now, this one is more applicable." I have already marked the scale on this, since the senior brother knows the usage, you might as well stay and try it a few more times, it should be of some help to refining the marrow washing solution. ”

Mao Zhongwu was overjoyed, he was on duty in the Dan room, and there was a limit on how many pills he needed to refine every day, and there was a reward for the excess. Of course, the marrow washing liquid is only one of several elixirs, but if it has the assistance of this magical Nine Heavens, it can be stably refined to a high-grade quality, and it is also a lot of income, or even if it is used for one's own cultivation, it is also good.

"In addition to this, well, the Nine Heavens of Ice and Fire, there are also some more magical instruments recorded in the book, which are also effective for other pills, and the junior sisters also want to try out them one by one, but I don't know if it will be too troublesome Senior Brother. Seeing that today's hard work was finally not in vain, Gui Yuan happily threw out the bait...