The duke of the governor's family is leaving again

Chapter 58
After listening to Liu Yanchun's explanation, Wei Xiancheng, who is good at focusing on key points, probably knows what the iodine fumigation method means.

"After iodine fumigation of fingerprints, it will turn brown first, so that the location of the fingerprints can be determined. Sprinkle starch on the fingerprints and moisten them to turn blue.

But the handle of the murder weapon was originally brown and had been fumigated with iodine gas. How could Li Fei find brown fingerprints on the wooden handle? "

He wanted to see how the dumb girl could fool people.

After hearing Wei Xiancheng's words, the people who were originally excited also calmed down instantly, "Yes, no one will use soft rice paper to kill people, so what do you do with the fingerprints on the paper?"

"Looking for a brown fingerprint on a brown handle, how do you find it?"

"It always feels like a waste of time."

"I wasted my hopeful heart, it's useless at all..."

The heart of the inexperienced Guan Zhixian also faded away.

Ge Xianwei, who has been in contact with a lot of various cases, does not think so, "The case is not only a homicide case, if the kidnapper writes a blackmail letter, he can also extract the kidnapper's fingerprints from the letter, determine the identity of the kidnapper, and catch and steal money. Ticket thieves can also use it."

"Besides, didn't Li Fei ask for other materials to be ground into powder and put them aside, and they haven't been used yet, I think..."

Lieutenant Ge Xian touched his chin and looked at the objects of different materials on Chen Yuan's table, as well as the unopened bottles and jars.

Years of experience in handling cases led him to a bold guess, "It should be fingerprints on objects of different materials. Different methods should be used to extract and fix fingerprints, and the method on white paper is the most obvious and allows us to easily Understood."

Chen Yuan glanced at Ge Xianwei in amazement. She didn't expect that he could come to the correct conclusion by looking at the leopard. This was exactly her plan.

As the saying goes, a person cannot be judged by his appearance, and whether he looks smart or not cannot be judged by the size of his official rank.

Guan Zhixian, who was on the side, was also opened up to a new idea by the words of Ge Xianwei.

He squinted his eyes and thought about it, always feeling that this method is wonderful and has a wide range of uses, and he just needs to develop it slowly.

A heart that cooled, thumped and jumped up again. After this method was presented, Guan Zhixian could see that Sijin Qiancheng was waving to him.

He is also not greedy, and he doesn't think he can catch up with the contribution of Lord Guo Xiuqi. As long as he can go up one level, it is also very good. "Quick, show me the fingerprints extracted."

Zeng Chi had already taken the paper from Chen Yuan when everyone was discussing, and looked at it for a while with brows of joy, and when he heard this, he immediately took the paper and handed it to the county magistrate respectfully.

Lieutenant Ge County sat next to Guan Zhixian, and bent over to take a look, and sure enough, the three blue fingerprints on it were very clear.

Liu Yanchun took a piece of paper full of blue fingerprints from the table in front of him, stepped forward and handed it to Guan Zhixian, "Mr. Magistrate, this piece of paper contains the fingerprints of all those who put fingerprints on the utensils, and two You can look for the interference items mentioned by Senior Sister, and see if the three fingerprints are on them."

Fingerprints are generally divided into three types: bucket type, bow type and skip type. At first glance, Guan Zhixian, although young, feels that the paper is densely packed with fingerprints.

Zeng Yuzuo has a lot of interest, but he is old, has bad eyesight, and looks like a bunch of flowers.

Master Xiao still looked like he didn't care about everything, just watched the excitement, and then held the record book and didn't move forward.

On the contrary, Wei Xiancheng, who wanted to find Chen Yuanjier, was more active than anyone else, and even though the magistrate was afraid of being too happy but troublesome, he looked embarrassed and said, "The magistrate is in charge of every day, and things like verifying fingerprints, let it go. The officer and the county magistrate will do it for you."

"It's very good, it's still the county magistrate who knows my heart." I hate that the county magistrate will rob everything, but when the trouble comes, the magistrate can't help but let him do it.

Wei Xiancheng took the two pieces of paper, "It's too dark, bring some more lights."

"Yes, my lord!" the officer said, the yamen broke his leg, who made it night.

Lieutenant Ge Xian also leaned over to compare it with Wei Xiancheng.

Liu Yanchun's piece of paper was covered with fifty fingerprints, and the two adults took out their enthusiasm for taking the imperial examinations and compared them carefully.

Guan Zhixian didn't care about those two pieces of paper anymore, and his subordinates would naturally share his worries with such a small matter of final verification. Moreover, he felt that Li Fei's confidence meant that the corresponding fingerprints could definitely be found on the two pieces of paper.

He danced excitedly, and urged, "Go on, what kind of device are you taking fingerprints this time?"

Thinking of Wei Xiancheng's suggestion, Guan Zhixian couldn't wait. "Let's just extract the fingerprints on the knife directly. This is also consistent with the murder weapon in this case. The fingerprints on other instruments should be taken slowly, not in a hurry."

Chen Yuan nodded.

Covered the lamp cover of the homemade alcohol lamp, put away the tools and materials for iodine fumigation, cleaned up the table, and took out a small box, which contained a round squirrel hair brush that she asked the county government to find someone to customize. One small squirrel hair brush, one feather fingerprint brush, and self-made inferior magnetic brushes, etc.

Although the metal powders of different colors in the sealed porcelain jars on the table are not as fine as 500 mesh, it is enough to use them.

Fresh sweat fingerprints on smooth and non-permeable objects can use magnetic powder to show fingerprints.

So she prepared daggers, jade pendants, inkstones, guqin, bluestone slabs, wooden sticks, white porcelain tea cups, glazed cups, roadside stones, rice paper, leather waistbands... These things, Chen Yuan used all the utensils The powder with high color contrast is lightly brushed on top with the corresponding brush.

Then on the black inkstone, 2 complete fingerprints of white pearl powder appeared.

On the silver-white blade surface of the dagger, there is one complete fingerprint of light rose red copper powder and one fingerprint on the upper half.There are four complete and neatly arranged fingerprints of white pearl powder on the handle of the brown knife, and one incomplete fingerprint.

Jade flute...

Compared with the chemical reaction of the iodine fumigation method, the physical method of using powder to brush the utensils to show fingerprints is easier for the ancients to accept.

Wei Xiancheng and Ge Xianwei have found the corresponding three fingerprints among the 50 blue fingerprints.

He was so annoyed in his heart that his face was so irritated that he didn't expect that the dumb girl actually had two brushes, which made him lose face and dignity in front of everyone.

I don't know why Guan Zhixian, Ge Xianwei, and Xiao Zhuzhu are laughing at him in their hearts.

At this moment, seeing Chen Yuan revealing the fingerprints on the utensils of different materials one by one, Wei Xiancheng felt a little better, and said with respect, "It turns out that only the iodine fumigation method can be seen, and the remaining utensils are not just brushed with a layer of powder. Well, what is the difference between such a simple method and what I said before to brush a layer of soot from a pot, that is, the color of the powder is different for easy identification." Li Fei, the dumb, took the lead.

In the night, it was already quiet, and Chen Yuan couldn't speak, only listening to Wei Xiancheng alone questioning and disgusting the past.

Even if someone thinks what he said is wrong, and they are afraid to speak because of their official position, or they don't know what Li Fei is going to do, they don't understand the principle of fingerprint extraction, and they don't know where to start if they want to say a few words for her.

　There were no machine tools in ancient times, and grinding metal powder would definitely not reach the fineness of 500 meshes today.

　　But let's just think that grinding metal powder can reach almost 500 meshes. After all, in this novel, there are martial arts and internal power.

　　Equivalent to

　　Indecision, quantum mechanics;
　　style jump, virtual world;
　　Can't explain, travel through time and space;

　　Don’t understand color matching, cyberpunk;
　　Not enough brain holes, parallel universe;
　　The picture is old-fashioned, and the pursuit of retro;
　　Not clear, tribute to Cthulhu.

　　Don't be too serious, thank you!
　　The force value is similar to that of "Sword Rain", "Dragon Gate Flying Armor" and "Embroidered Spring Knife", and it will not be too far from the high martial arts of humans! !
　　It is not a high martial arts world, there is no immortal cultivation, and if you have martial arts inner strength, many problems can be solved.

　　The heroine is a science student, and there is no problem with physicalization. The weakness of liberal arts can produce many things that are not outrageous and do not require modern technology. Try not to exceed the production level of the Ming and Qing Dynasties, and try to be reasonable (I really want to make Fluorescent powders were all produced, but the technology at that time did not allow such precise extraction, and the heroine couldn’t produce it no matter how awesome she was, but the simple and easy-to-obtain natural compounds and relatively simple chemical reactions, the female goose must be able to do it, that is The experimental conditions need not be too harsh.)
　　\(^o^)/
　　
　
(End of this chapter)