May 25, 2 p.m. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

At the Kasai Police Station, in the physical evidence technology laboratory on the second floor, Qin Yun, an international student from Xia Kingdom, is asking Nanlin Guiyi for advice on how to extract fingerprints from the surface of soft objects.

For example, how should the fingerprint of an inside page of a book be extracted.

Fingerprint extraction is one of the most important skills of forensic technicians, and it is used in a variety of crime scenes, whether it is a serious homicide case or an ordinary theft case.

Normally, there are two types of fingerprint extraction schemes.

The first type of area where fingerprints are left is a non-absorbent area, such as a metal surface, a glass surface, a porcelain surface, or a plastic surface.

The surface of these non-absorbent materials leaves fingerprints, and the method of extracting them is relatively simple, and the powder method can be used. The so-called powder method is to sprinkle fine powder with a large color contrast on the area where fingerprints may have been left, and then use a soft fine brush to brush off the powder to obtain fingerprints.

This method has a very high appearance rate in all kinds of film and television works!

The second case of fingerprint extraction is a bit more complicated, on top of the absorbent material, the fingerprints that may be left behind. The question that Qin Yun asked for advice belonged to this kind.

Nanlin Guiyi explained to Qin Yun, including the silver nitrate method, iodine fumigation method, fluorescent reagent method, and Hydelin method. The iodine fumigation method is mentioned in junior high school chemistry textbooks in some countries.

The other three methods are also exported in various film and television works.

"Senior, can you demonstrate the iodine fumigation method?" Qin Yun looked at Nanlin Guiyi with pitiful eyes, her eyes were big, as if she could speak, which made it difficult to refuse.

Nanlin Guiyi thought about it for a while, and finally nodded in agreement, "Yes!" ”

The iodine smoking method is more commonly used, and when the processing is completed and the fingerprint is displayed, there is a little trick, and some newcomers often forget the final processing work.

Nanlin Guiyi didn't have the idea of hiding his secrets, after all, Nanlin Guiyi was not prepared to be limited to the Physical Evidence Division, and he had now been officially transferred to the fourth squad of the Search Division.

"Thank you, Guiyi senior!" After Qin Yun finished speaking, he quickly took out a piece of A4 printer paper and continued, "This is the sample I asked for by Fukuda Kato's predecessor before, and it contains Fukuda Kato's senior's fingerprints. What should we do now? ”

Nanlin Guiyi did not take the A4 printing paper, but first put on light blue rubber gloves before taking the A4 printing paper, and said to Qin Yun: "As a physical evidence technician, the first core criterion is to protect the physical evidence from destruction!" You're holding physical evidence that may contain important fingerprint clues, and you've destroyed it! ”

Qin Yun hurriedly apologized, "I'm sorry, I'm a senior, I remember!" She said as she put down the A4 paper and quickly put on her pale blue rubber gloves.

Nan Lin Guiyi picked up the A4 printing paper, observed it first, and then continued to explain, "Do you know what preparations are there for doing iodine fumigation fingerprint extraction?" ”

Qin Yun was about to answer when a dull explosion came from downstairs.

"Bang~"

At the same time, there was a loud noise on the first floor, and it was clear that something had happened!

Nan Lin Guiyi's face changed slightly, although the explosion sound from downstairs was not loud, but the important thing was that Butler reported the information to Nan Lin Guiyi in the bone conduction headphones.

"Sir, the system has detected that the police system of the Kasai Police Station is being controlled, and the intruder has injected a virus of a destructive nature and is compromising the security monitoring system. The system predicts that the security system of the Kasai Police Station will be taken offline within ten seconds. Countdown..."

This piece of information is the reason for the change in Nanlin Guiyi's face!

The Kasai Police Station has been quiet lately, and nothing has happened at all, but what is happening now is obviously not normal.

Could it be that the S organization found some clues?

"Returning to the seniors, what happened?" Qin Yun nervously followed Nanlin Guiyi's side, perhaps because she was afraid, she grabbed Nanlin Guiyi's arm.

A touch of helplessness flashed in Nan Lingui's eyes, Qin Yun was too close to him, and if he wanted to contact Butler, it was impossible to hide Qin Yun. In order to avoid exposure, Nanlin Guiyi had no choice but to give up his connection with Butler.

"I don't know, you wait for me here, I'll go down and have a look!" Nanlin Guiyi appeased Qin Yun, and naturally broke away from Qin Yun by the way.

However, when Nanlin Guiyi had not yet gone downstairs, four dull explosions came almost in no particular order. If it weren't for Nanlin Guiyi's sensitive hearing, he wouldn't have been able to judge at all.

Of course, even if Nanlin Guiyi can't tell, Butler can also judge through bone conduction headphones or mobile phone microphones.

'Damn! What's going on! Nanlin Guiyi was originally going to go downstairs to check, but the current situation made Nanlin Guiyi vigilant.

Nan Lin Guiyi returned to the physical evidence technology laboratory, and greeted Qin Yun, and said in a low voice: "The situation is wrong, come here!" He took Qin Yun to hide behind the workbench in the physical evidence technology laboratory, and at the same time took a bottle of nitric acid as a defensive weapon.

"Are we in danger when we return to our predecessors?" Qin Yun asked nervously.

"Shh Nanlin Guiyi made a silent action, and at the same time took out his mobile phone, lowered his voice and said, "Take out the mobile phone, completely mute the setting, and don't vibrate!" ”

How many people who have been in hiding have been found because of the ringing of their mobile phones or the vibration of their mobile phones?

Nanlin Guiyi couldn't figure out the situation now, and he didn't know what was going on at the Kasai Police Station, but there was a noisy noise downstairs just now, and after the other four dull explosions, the noisy sound gradually disappeared, and Nanlin Guiyi had already raised his vigilance.

Qin Yun followed Nanlin Guiyi's instructions, set his mobile phone to a safe and silent state, and then carefully hid by Nanlin Guiyi's side. However, Nanlin Guiyi didn't find that there was not the slightest nervousness in Qin Yun's eyes, or any uneasy fluctuations.

Nanlin Guiyi held his mobile phone and quickly edited the content of the text message. While editing the text message, he naturally turned his head sideways to prevent Qin Yun from seeing his lips, and then quickly contacted Butler.

"Butler, retrieve Fukuda Kato's location, control Fukuda Kato's mobile phone, set mute and vibration frequency, and reduce the intensity of vibration." Nanbayashi Guiyi commanded, he didn't know Fukuda Kato's situation, so he could only mute Fukuda Kato's mobile phone and reduce the vibration intensity, so that when he sent a message over, Fukuda Kato could know, and not attract attention to it to the greatest extent.

"Sir, you've finished setting up." Butler responded.

After receiving Butler's feedback, Nanlin Guiyi confirmed to send a short message, and then naturally changed the angle of turning his head, and there was nothing abnormal at all.

"I've sent a message to ask Kato-senpai, and now I'm patiently hiding." Nanlin Guiyi responded.

Qin Yun nodded affirmatively, "Okay!" ”

As for the Kasai Police Station, what exactly happened, Nanbayashi Guichi really doesn't know, so he can only wait for Fukuda Kato's response...

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