The duke of the governor's family is leaving again

Chapter 57 Iodine
"My lord, I'll start." Chen Yuan held up the cardboard and put on gloves and a homemade mask after getting permission from the magistrate sitting in the upper position.

In the middle of the custom-made iron frame, a white porcelain crucible the size of a porcelain cup was placed, and an alcohol lamp made of purified liquor was placed below.

Pour the yellow iodine solution extracted from the kelp into a white porcelain crucible, light an alcohol lamp, and place the fingerprinted rice paper on top of the crucible.

In the eyes of everyone, Chen Yuan is like a fool, holding a piece of white paper to and fro to make fun of people.

After a while, purple gas rose from the white porcelain dry pot.

"Ziqi, this is the image of auspicious auspiciousness!" Guan Zhixian saw it, his hands trembled with excitement, and he couldn't sit still.
"How can yellow water turn into purple air?" When the yamen saw this, they looked at me and I looked at you, and they didn't understand the reason at all, "Could this be an immortal method?!"

Regarding everyone's exclamations, Chen Yuan can only say: learn physical chemistry well, you will not be afraid to travel through the past and the present, and if you don't learn physical chemistry, life is full of magic.

In the future, she will definitely give everyone a small chemistry class with Teacher Chen, and lead the ancient criminal investigators to break the feudal superstition and solve the case with scientific methods.

Wei Xiancheng, who didn't dare to pick him up in front of the magistrate, could only scold at the suspicious yamen, "What immortal method, but an alchemist's blinding method, I don't know what miscellaneous books Li Fei read and learned tricks. If you smoke purple gas, you can extract fingerprints? Why not just use firewood to smoke black gas? Waste manpower and material resources to accompany her to waste so many good things."

Li Fei is a broken house, and the precious kelp has to say what kind of kelp.

It was the precious seafood brought back by the merchant from thousands of miles away. He couldn't eat kombu several times a year, but she used it and burned it directly into ashes...

You said it was outrageous!
What's even more irritating is that this miser from Guan Zhixian County is still fooling around with a dumb girl.

The county government didn't have that much budget, so the county magistrate gave all the kelp that he brought from his hometown to the mute.

By the way, the magistrate not only gave more than ten feet of dry kelp cloth to the mute girl, but also took a dozen pearls from the magistrate's wife's jewelry box to the mute girl, a prodigal son.

Moreover, more than ten fine pearls were all ground into powder by that abominable mute...

Kumbu ash, pearl powder... Wei Xiancheng's heart was broken.

After knowing the news, he was restless and in a trance for two days, and had nightmares for two consecutive nights, dreaming that all the treasures he treasured were found by a dumb girl, burned to ashes and hammered into powder in front of him. .

You are a bunch of me, and no one can recognize who.

At that moment, Wei County Chancellor really felt that those run-down households in Dumin Village were really wealthy owners, even a dumb girl, and those people were probably even more capable of spoiling good things in the past.

It's a pity that all the money was raided when he was in the capital, and it was impossible for the border sesame officials to lick the soup.

The more he thought about it, the more resentful Wei Xiancheng felt towards Li Fei.

Chen Yuan abandoned the outside interference, and seriously tossed the paper in her hands.

The iodine is heated and sublimated into purple iodine vapor, and the iodine vapor has a physical adsorption effect on the sebum in the fingerprint, and then the iodine reacts with the sebum acid in the fat.

After a while, three brown fingerprints of different sizes appeared on the pure white paper.

"Appeared!"

"It's really in the shape of a fingerprint!"

Originally, many people had been staring at Chen Yuan, but the sharp-eyed people noticed it immediately, and shouted excitedly.

Guan Zhixian and Ge County lieutenants immediately jumped out of their chairs and wanted to run over to take a closer look, but were stopped by Zeng Shuisheng and Liu Yanchun.

A look of doubt appeared on the faces of the two adults, but Wei Xiancheng, who was sitting on the chair and did not move, took the lead in attacking, "Bold, you dare to stop the adults, are you doing tricks to deceive us with this trick, for fear of missing the stuffing? , dare not let the magistrate come to check?"

"No, it's not like this..." Being yelled at by Wei Xiancheng, Zeng Shuisheng's eyes turned red with fright.

Liu Yanchun patted him on the shoulder and motioned him not to speak, "My lord, the second sister is wearing a mask because the purple gas is poisonous and smells bad, so she said in advance that before fixing the fingerprints, let everyone Don't get close."

"Poisonous?" Guan Zhixian took a big step back, and everyone covered their noses with their sleeves.

Wei Xiancheng did not give up any chance to suppress the dumb, "Poisonous! Then why did Li Fei only prepare masks for herself and not us? What is her intention?"

"Don't worry, adults, this poisoning is not another poisoning, and it will not kill people. Inhaling a large amount of it will make people uncomfortable with runny nose and tears, burning throat, cough, difficulty breathing, and phlegm." Chen Yuan gave these precautions to the participants in advance. The person who made the material said that Liu Yanchun remembered the prison and had the courage to make it clear in front of the adults.

Liu Yanchun pointed to Chen Yuan's side, "If she doesn't wear a mask, it will affect the fingerprint extraction. We are far away, and it will not be affected at all. Everyone stays where you are, and you don't smell the unpleasant pungent odor. This is no problem. of."

Wei Xiancheng wanted to say something, but saw that Chen Yuan scooped a spoonful of white powder into a clay pot marked with starch, and used a small sieve to evenly spread a thin layer of starch on the brown fingerprints that had already appeared.

"Isn't the fingerprint already extracted? What else is she going to do? Why sprinkle starch on the paper?"

Chen Yuan had long expected that she would be asked a lot of questions during the experiment. She couldn't open her mouth, and she couldn't stop the experiment to write answers, so she made preparations in advance.

Afraid that Liu Yanchun would not be able to remember so many terms that he had not been exposed to before, he wrote a piece of paper and wrote down answers to common questions.

Liu Yanchun took out the paper, found the corresponding question, and read it according to the script, "The invisible and colorless fingerprints on the paper are fumigated with iodine vapor and appear as brown fingerprints, but the iodine will sublimate at room temperature, so the iodine-fumigated fingerprints will follow It fades over time until it disappears, so starch fixation has to be used to preserve fingerprints for a long time, based on the fact that starch turns blue when exposed to iodine."

As he finished reading, Chen Yuan had already wet the starch sprinkled on the paper with water vapor, and the original brown fingerprints turned into blue fingerprints in front of everyone.

The yamen couldn't help but patted his thigh, "I'll drop a mother, it's amazing!"

"The original invisible fingerprints turned brown and blue for a while. How did this happen?"

Zeng Chi couldn't hold back his excitement at this moment, he covered his nose with his sleeve and approached Chen Yuan, "Now, can you really keep your fingerprints forever?"

Chen Yuan shook her head, and Liu Yanchun found the answer on the paper to answer for her, "It can only be kept for a long time, not permanently, so it is best to find an artist to paint it according to the fingerprints without any difference."

"This...that's not bad."

Although everyone was puzzled, Zeng Zuozuo said so and nodded in agreement.

"What's good, it hasn't lasted as long as the ink pad." Wei Xiancheng was angry when he saw them, "What's the use of extracting fingerprints from paper, would a murderer use paper to kill people? It took a lot of time to do this. No, why don't you hurry up and extract the fingerprints on the knife."

(End of this chapter)