Yangning Kingdom, death row.

Ye Feng sat in the prison, playing with a stone in his hand, looking at the jailer who was still trembling about the haunted incident outside the door, and a smile appeared on his lips: "Little girl, can't I control you ancient people?"

When he just heard the ghost soldiers borrowing the road, he had a vague guess in his heart that the so-called ghost fire is likely to be phosphorus fire.

For a modern person, this kind of ghost fire is very common and is more common in cemeteries because human bones contain phosphorus elements. After the corpse decays, it will produce phosphine. The ignition point of phosphine is very low and can be spontaneously ignited. At the same time, because the pressure in places with large fluid flow rates is small, it will drive it to move behind when walking.

This is widely used in modern criminal investigations because the national cremation is now implemented. If phosphorus fire occurs, it means that there are very likely boned corpses there.

In ancient times, although phosphorus was not clearly defined, it was widely used, especially in ordnances.

Because the melting point of pure iron is 1538 degrees Celsius, only at this temperature can pure iron change from solid to molten state. Due to the limitations of ancient production conditions, this temperature is far from reaching, so the ancients needed to add elements such as sulfur, phosphorus, silicon, manganese, etc. when smelting iron.

Iron with impurities added can be greatly reduced in melting point, so that it can be refined into an iron tool.

They called the stone containing other elements forged stones, and Ye Feng just grinds the forged stones with extremely high phosphorus content, exposing the phosphorus in large quantities and sufficiently, forming a ghostly fire-like smoke.

"Jiuxingsi investigates the case and opens the prison door!"

Not long after, Lin Xiyao's anxious voice came.

This time, the prison guards showed humility and quickly opened the prison door without saying a word.

Now they are a community of shared destiny, and they only hope that the Nine Stars Department can quickly solve the haunted matter in the death row. They are just a job owner and no one wants to leave their lives at work.

Lin Xiyao stepped into the prison, looked at Ye Feng with a smile on his face, and asked, "Have you heard of the haunted place in the death row last night?"

Ye Feng slowly stood up and replied with a smile: "Of course I heard about it."

Ye Feng's reaction at this moment was completely different from yesterday. If he was still afraid of death yesterday, he looked dull, today it had a sense of confidence and confidence in winning.

The more Lin Xiyao thought about it, the more something was wrong. Her eyes flew, and she subconsciously asked: "This haunted thing... won't have anything to do with you, right?"

Hearing this sentence, Ye Feng's smile became stronger and he looked at Lin Xiyao with some playfulness: "If it had nothing to do with me, would you come to see me today?"

"What's the meaning?"

Lin Xiyao stood there in a daze. She could not imagine what the haunted death cell could have to do with Ye Feng wearing heavy shackles.

Seeing this, Ye Feng didn't keep it aside and stopped when he saw it. He spread his palms and showed Lin Xiyao the stone in his hand: "This is it."

At this moment, Lin Xiyao was even more confused: "Isn't this the forging stone you asked me to find you yesterday?"

Ye Feng nodded and changed to a serious face: "The Yin soldiers made it out of this kind of stone."

"The Yin soldiers borrowed the way? Use this stone to make it out?" Lin Xiyao looked disbelieving.

But Ye Feng nodded, saying that this is the case.

At this moment, Lin Xiyao only felt that she was being fooled. She took a deep breath and suppressed the anger in her heart.

I have been busy with my family affairs for several days and haven't met my eyes for several days. Now, Ye Feng, a silly boy, dares to play tricks on me.

She looked at Ye Feng, suppressed her anger and reorganized the language: "I know you are a little unacceptable to this matter, but don't give up on yourself. The Jiuxingsi is thinking of ways, and you can persist..."

Ye Feng raised his hand and interrupted: "What you call forged sword stone is actually a kind of apatite. When phosphorus burns, it contains impurities, so it will form a green flame, that is, the ghost fire in your mouth. If the phosphorus can be extracted and a certain amount of phosphorus can be collected, a large amount of ghost fire can be formed. The ignition point of phosphorus is very low, and it is summer now, and phosphorus can be spontaneously ignited when exposed to the air."

Lin Xiyao couldn't understand what he was saying at all, just closed her eyes slightly and asked in a tone of chatting with a fool: "What about?"

"Then it means that the Yin soldiers' accession is completely artificial because of phosphorus..." Ye Feng was still explaining chemistry to Lin Xiyao seriously, and suddenly looked up and met her somewhat impatient eyes, and subconsciously raised his voice: "Why don't you believe me? Go and ask the prison guards! They saw the green smoke with their own eyes last night."

Lin Xiyao slowly opened her eyes and looked at him: "But the green ghost fire that the Yin soldiers used is completely different from the green smoke in your mouth."

"That's because I can't extract a certain amount and purity of phosphorus in this broken prison. As long as you take me out, I promise to make a green ghost fire for you!"

Ye Feng jumped and shouted, feeling like a child was angry and talking.

But there was an extremely firm light in his eyes, and there was an indescribable confidence on his face.

Lin Xiyao frowned at him and asked tentatively: "Are you... serious?"

"I'm serious. As long as you let me out and prepare something for me, I will definitely make you a green ghost fire."

This time, Ye Feng's tone was very low, making him look more calm, which makes people believe more.

"Oh, let's be a living horse. My father gave me the task of saving the Ye family at all costs. There is still two days left. It's impossible to count on the group of fools in Jiuxingsi..." Lin Xiyao thought for a while and said to him: "What do you need?"

...

Nine Stars, back hall.

Ye Feng walked in with shackles.

At this moment, everyone was stunned.

"No, Miss Lin took the death row prisoner out of the death row? She also brought it to the Nine Star Division?!"

"It's so crazy!"

"If the emperor knows this, we will lose our heads!"

Lin Xiyao looked at everyone coldly and said sternly: "I brought the person out. If something happens, our Lin family will hold on. Don't talk nonsense, what are you going to prepare?"

These words blocked everyone's mouths.

“It’s all on the table.”

One person pointed to the wooden table next to it, with different types of sand, porcelain cups, porcelain bowls and other utensils on it.

Ye Feng walked to the table with his shackles, carefully checked the utensils in front of him, and then checked the sand and stones, which were apatite, quartz stone, etc. These were all required for the production of weapons and porcelain in ancient times, and the purity was quite good.

What he has to do now is to make white phosphorus.

As long as the sand and stone mixture is placed in a container, heated to 1,600 degrees Celsius, and the generated steam is passed into cold water, solid white phosphorus can be extracted.

Hope it will succeed.

Ye Feng took a deep breath, mixed several kinds of sand and stones, and put them into a container.

But the next second, he was stunned.

Because here, there is no way to heat the mixture in front of you to 1600 degrees Celsius!

"What's wrong?"

Seeing Ye Feng stunned in place, Lin Xiyao walked to him and asked in confusion.

Ye Feng slowly raised his head, his eyes full of loss: "There is no way..."

"There is no way?" Lin Xiyao was stunned and a little surprised: "What can I do?"

Ye Feng nodded weakly and said, "If you want to make white phosphorus, you must heat these to an extremely high temperature. It is impossible for you to......"

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