I am a super cop

Chapter 386 Dig a pit and bury myself

"Flaw?" Master Kang liked this word the most, especially at this moment, when Zhu Ruiping's aggressive posture made him feel a little out of breath.

Gu Chen's words are undoubtedly timely rain.

Secretary Zhou also stared at Gu Chen with wide eyes and asked, "Officer Gu, you said that Zhu Ruiping's mortgage letter is fake, what evidence do you have?"

"Yes, you... What evidence do you have? Why do you say that my mortgage letter is fake? You are slandering."

Hearing the conversation between Secretary Zhou and Gu Chen just now, let Zhu Ruiping know that the person standing here in front of him, accusing him of forging the house deed and mortgage, is a policeman from the criminal investigation team of Furong Branch of Jiangnan City, and he couldn't help but feel a little nervous .

But the nervousness was the nervousness. At this moment, Zhu Ruiping had no way to retreat, and he would never give in.

"You don't need to pretend to be wronged and indignant." Gu Chenyun looked at Zhu Ruiping calmly, then flipped through the yellow paper back and forth, and said with a smile: "As far as your handwriting is concerned, although it was Mr. Kang's handwriting when he was alive, it is correct. , but it is not necessarily written by Mr. Kang."

"What... what do you mean?" Zhu Ruiping looked at Gu Chen in confusion.

Gu Chen said with a smile: "That is to say, you can find a master calligrapher to copy out a mortgage letter with exactly the same handwriting according to Mr. Kang's calligraphy handwriting and habits during his lifetime."

"what?"

"Can you copy it?"

"Why didn't we think of it before?"

"That's right. If you are a master of calligraphy, you can definitely write this kind of handwriting. For example, Wang Xizhi's calligraphy in those days, many people have completely mastered it. the same."

After hearing Gu Chen's words, many people suddenly realized that the situation Gu Chen mentioned was completely possible.

Zhu Ruiping refused to accept it, and said again: "But... But this is just your one-sided statement, it's just a hypothesis, there is no real evidence at all, why do you say that this mortgage letter is forged by copying handwriting?"

"Yes." An executive standing behind Zhu Ruiping also stood up immediately, pointed at Gu Chen's nose and said, "You policeman is really ridiculous, you copy it if you say it? This is something from the age , the paper is all yellowed, obviously it was written by Mr. Kang himself."

"It's fine if you don't tell me." Seeing the other executive's aggressiveness, Gu Chen just shrugged and walked in front of him with ease.

The executive of the Zhu family, who was half the head of Gu Chen, quickly stepped back two steps, and kept a relatively safe distance from Gu Chen, saying: "It was."

"Then have you ever considered why this piece of paper turned yellow?" Gu Chen's soul torture immediately stunned the executives of the Zhu family on the opposite side.

He only knew that the paper would turn yellow after being left for a long time, but he never thought about why it turned yellow.

"I can tell you." Gu Chen smiled, and took two steps forward: "Because the paper is bleached with acidic substances, although it was neutralized before leaving the factory, there will still be residual substances left on the paper. Above, over time, the paper will be oxidized and turn yellow, which is actually the oxidation of the paper components.”

"So...so that's how it is." The executives of the Zhu family were stunned for a moment, and the arrogance just now subsided a lot.

Gu Chen then walked in front of Zhu Ruiping and said: "Lignin is one of the main components of plant fibers. It has aromatic properties and is a compound containing carbon, hydrogen, and oxygen. According to chemical analysis, lignin contains the following functional groups."

"Wait." Zhu Ruiping suddenly interrupted Gu Chen, and asked, "What exactly is this 'functional group' you're talking about?"

Gu Chen smiled: "Functional groups are atoms or groups of atoms that determine the chemical properties of organic compounds. Can you understand that?"

Zhu Ruiping seems to understand but not understand.

I was originally a scumbag, although I went to the United States to study abroad, but I was just a pheasant university.

However, Zhu Ruiping still has some vague concepts about atoms and atomic groups.

"You...you talk." Seeing that Gu Chen was staring at him, Zhu Ruiping had no choice but to shut up again.

Gu Chen looked back, and then said: "I just said that the functional groups contained in lignin actually include methoxy, hydroxyl, carbonyl, aldehyde and ether bonds."

"Lignin is white or nearly white, insoluble in solvents, and has a fragile texture. It can be dissolved at high temperatures, and its solution is milky white or dark brown."

"Because lignin contains various functional groups, its chemical properties are relatively active, such as sulfonation reaction, lignin becomes soluble lignosulfonate, and oxidation becomes soluble chlorinated lignin."

"But lignin is the easiest to oxidize, especially in the presence of light, high temperature and alkali, and the oxidation is more rapid."

"Moreover, modern paper contains more lignin, so newsprint is easy to turn yellow and brittle, and it is not easy to store for a long time."

"That's right." Hearing this, Lu Weiwei couldn't help interjecting: "The old newspapers in my house are the easiest to turn yellow, and they are yellow and brittle, and they can be broken if you just pinch them."

"My family also has it." Nie Xiaoyu couldn't help but say a few words: "This kind of old newspaper, my family has a lot, it's really the same as what Gu Chen said, so there are so many chemical factors in it. .”

Zhu Ruiping was obviously confused by what Gu Chen said.

He could tell that the young man standing in front of him was obviously a top student.

At the very least, the fact that he can blurt out this seemingly complicated knowledge is enough to show how strong the knowledge reserve in his mind is.

Ordinary people, even if they can occasionally see it in the library, they may not be able to remember it so firmly.

But the young man in front of him can do it, which is a bit scary.

Seeing that Zhu Ruiping stopped talking, Gu Chen smiled and said, "So, it can be seen that since the paper-making raw materials contain plant fibers, especially lignin, pectin, fat, pigment and other ingredients, it has laid a solid foundation for the harm of paper. There are potential factors, so there are these problems, but your yellow paper..."

Gu Chen deliberately scratched the corner of the yellowed mortgage with his fingers.

However, to everyone's surprise, the paper was intact. Gu Chen continued to buckle it hard, and the paper began to be buckled by a corner.

"Tsk tsk, the paper that is about 20 years old is not as brittle as it is." Gu Chen looked at Zhu Ruiping again.

Zhu Ruiping was a little flustered, and even seemed to be retreating. However, at this time, another tall and thin middle-aged executive with black-rimmed glasses and a capable appearance appeared beside Zhu Ruiping again.

He was like a staff general, showing a hint of disdain for Gu Chen's question.

"I said this young man, oh no, he should be called Comrade Police, right?" The tall and thin man with glasses looked disdainful.

Gu Chen shrugged: "Whatever, do you have anything to say?"

"Hmph." The tall and thin man with glasses snorted twice and said, "What you said is correct, but you also need to know that if I can do these three points, the paper will turn yellow or reduce its brittleness. It's totally achievable."

Seeing that the other party was full of confidence, Gu Chen nodded, stretched out his hand and said, "I would like to hear more about it."

"This is number one." The man imitated Gu Chen's aggressive appearance just now, raised his head, put his hands behind his back, walked up to Master Kang, and said:
"The first point is to reduce contact with air, the second is to reduce contact with moisture, and the third point is to reduce contact with sunlight."

Gu Chen folded his hands on his chest, rested his chin and thought for a few seconds, then nodded and said, "That's right, what you said is right."

Seeing Gu Chen's approval, the tall and thin man with glasses, who looked like a schoolmaster, suddenly felt a little proud, and said:

"Contact with the air is unavoidable for most people, but you can try to avoid contact with moisture and sunlight."

"If you don't often use certain books, you can try to put the books in a plastic bag and seal them, and then take them out when you need them."

Gu Chen nodded: "Please continue."

The tall and thin man with glasses smiled, and walked up to Secretary Zhou again: "The storage period of paper is usually not more than one year. Even if the storage conditions are good, the paper will change color and deteriorate if it is stored for a long time."

"If the paper is stored for two years, the coated paper will turn yellow and powder off, the newsprint will turn yellow and become brittle, the wrapping paper will change color and its strength will decrease, and the yellow cardboard and cardboard will become moldy and deteriorate, etc."

Seeing that everyone at the scene suddenly fell silent, as if this was his own stage, the tall and thin man with glasses was immediately complacent, and the corner of his mouth raised a confident arc.

He continued to smile at Gu Chen: "So under normal circumstances, the white paper we use is made of fiber pulp formed by processing tree fibers in paper mills, which is spread flat on a flat plate and dried in the sun."

"But you can imagine the color of the cross-section of the tree trunk. The wood fiber is slightly yellowish, so sulfur dioxide is used in the industry to bleach the paper."

"However, the bleaching of sulfur dioxide is not as stable as chlorine gas. It is easily oxidized by oxygen into sulfuric acid and loses the bleaching effect, so that the color of the wood fiber itself is exposed. This is what Officer Gu said before."

Gu Chen continued to nod, but did not speak.

"Sulfuric acid will destroy the fibers in the paper." The tall and thin bespectacled man raised his right index finger, as if he was teaching a group of scumbags like an expert, and his words were quite self-confident:

"So the paper becomes brittle. Also, the paper is too dry and the lignin in the paper oxidizes and causes the fibers to break and cause the paper to become brittle."

"So, if you can achieve the three points I mentioned before, what about the yellowing of the paper? The brittleness of the paper can theoretically meet the requirements of your experiment just now."

"Okay." Seeing that his executives were able to PK Gu Chen, Zhu Ruiping suddenly became excited.

He slapped the tall and thin man with glasses on the shoulder, almost shaking the man's black-rimmed glasses.

The tall and thin man with glasses immediately adjusted his glasses, straightened his shirt with pride, and exhaled with his chest raised, like a victorious rooster, looking at Gu Chen arrogantly.

Lu Weiwei was stunned.

Nie Xiaoyu was also stunned.

Including Police Officer Wang, Master Kong, Bai Xiaolan and Wu Jun from the TV station, Secretary Zhou and foreign businessmen, all of them were shocked by the remarks of the tall and thin man with glasses.

He directly used his own theory to negate Gu Chen's previous experiments, and made a reverse proof.

It proves that the situations Gu Chen mentioned also have special circumstances.

A high salary is not for nothing. You have to stand up and help the boss solve problems at critical moments. This is the experience of the tall and thin man with glasses. It feels so good.

He even excitedly wanted to give Zhu Ruiping a high-five to celebrate, but he restrained himself because of the environment of the scene.

Gu Chen suddenly covered his mouth and started laughing, which made Lu Weiwei and Nie Xiaoyu beside him not understand.

That tall, thin-eyed man just now was so aggressive against Gu Chen, how could Gu Chen still laugh out loud?
This doesn't look like Gu Chen's style, does it?
Master Kang was also in a hurry: "Gu Chen, it's this time, how can you still laugh? When that guy with glasses said that, doesn't it prove that their mortgage letter is real?"

"Master Kang, don't worry." Gu Chen also smiled, and said calmly: "They are so eager to prove, but they dig a hole and bury themselves."

"What? Digging a hole yourself? And burying yourself?" Master Kang was a little confused by Gu Chen, and he didn't know what to say: "Gu... Gu Chen, what do you mean by that?"

"Yeah, Junior Brother Gu." Lu Weiwei, who seemed to know Gu Chen very well, now had a harder time understanding what Gu Chen was thinking.

The OS is not working?
Telepathy gone?
Why can't Gu Chen understand this wave?
Nie Xiaoyu also hurriedly asked Gu Chen: "Brother Gu Chen, why do you say that, did they expose themselves?"

"Almost." Gu Chen crossed his arms, already confident.

It seemed that the other party was bouncing so hard in front of him that he was undoubtedly digging a hole for him.

Zhu Ruiping and the tall and thin man with glasses on the opposite side were also stunned by Gu Chen's surprisingly calm.

The two had never met before. When they had nothing to say about their opponents, the other party actually laughed?
What kind of operation is this?

Zhu Ruiping stepped forward and said, "Young man, what are you laughing at? So happy?"

"I laugh at you for helping me to explain all the things I wanted to add before, just to save me from telling everyone."

"What?" The tall and thin bespectacled man was taken aback for a moment, then froze for a moment: "You mean..."

"What I mean is, you helped me explain why the paper that has been yellow for more than 20 years can have such hardness. This is another reason I want to talk about." Gu Chen answered directly.

Then Gu Chen brought the yellowed paper back in front of everyone: "As the gentleman wearing glasses said just now, if I can reduce the contact with the air, reduce the contact with water, reduce the contact with the sun The contact can indeed keep the hardness of the paper, and it will not be fragile after it turns yellow."

"But sir, have you ever thought that this is a paper that has been obviously folded and preserved."

"If it was written 20 years ago and it was folded and preserved, it should be yellow on the outside and white on the inside."

"However, the inside and outside of this document." Speaking of this, Gu Chen specially turned the two sides back and forth for everyone to see, and then said: "However, the inside and outside of this document are all yellow, and the yellow is so uniform. "

"what?"

"I rely on it, it's true."

"This mortgage is really all yellow. If it is folded for storage, it must be because the outside of the fold is yellow and the inside is white?"

"This guy is right. How could this piece of paper be all yellow after more than 20 years? And the color is so even?"

For a while, the surrounding leaders, foreign businessmen, and enthusiastic people all began to agree with Gu Chen's rhetoric.

On the contrary, Zhu Ruiping and the tall and thin man with glasses panicked.

The tall and thin man with glasses told Gu Chen and everyone how to keep the paper yellow and brittle with his own set of compelling rhetoric.

But he did not tell everyone that when the paper is folded and stored, the outer part that is in contact with the air will obviously turn yellow.

Moreover, there will be a clear color difference from the inner paper part, but this is not the case at all on the mortgage letter that Gu Chen is holding.

The tall and thin man with glasses panicked, and he successfully dug a big hole for Zhu Ruiping with his high-profile rhetoric.

Zhu Ruiping's face is turning green now...

The excitement just now lasted only a dozen seconds, but now he felt deep despair.

At this moment, Secretary Zhou stared straight at Gu Chen, and hurriedly asked him: "Officer Gu, then... how did you get the yellow color of the mortgage letter?"

"I see that the corners here are also damaged, and the color difference of the whole white rice paper seems to be some years old. If it is forged, then it has to be prepared a few years ago?"

"It's not that complicated." Gu Chen waved his hand, dispelling Secretary Zhou's worries, and said lightly, "This color is obviously dyed with some kind of solution. What is it?"

Gu Chen then sniffed it with the tip of his nose, and then clicked his tongue twice: "Oh! By the way, it's tea juice. It's Mr. Zhu Ruiping. He dyed the paper with tea juice, turning the paper yellow."

When Mrs. Kang heard this, she hurried to Gu Chen's side, took the mortgage letter from Gu Chen's hand, put it on the tip of her nose and sniffed it, and then said:

"Gu Chen is right. I've been making tea for so many years, and I can tell if it's the tea juice when I smell it. Although the taste is very weak, it's obviously been a while, but it definitely tastes like tea juice."

"Let me take a look." Seeing this situation, another foreign business representative quickly stepped forward to take the paper, and sniffed it like Mrs. Kang said: "Well, that's right, it's tea juice, and it's the best-selling product this year. That tea."

"let me see."

"I'll take a look too."

……

Immediately, many senior people in the tea industry also volunteered to check.

Sure enough, everyone not only smelled the tea juice, but also guessed which kind of tea it was.

As for the problem of uniform yellowing of the paper, the truth became clear under Gu Chen's reasoning.

Now Zhu Ruiping was completely panicked.

Originally, he had carefully planned this fabrication, but he didn't expect that it would be exposed by the young man in front of him.

This young man is simply terrifying.

Facing the verbal and written criticism of many people, Zhu Ruiping was afraid, he was afraid that he would be torn into pieces by the crowd at the scene, so he turned around lightly, and Zhu Ruiping ran away.

"Look, the surname Zhu has run away." Lu Weiwei, with sharp eyes, noticed the situation at a glance.

……

(End of this chapter)