The third special substance, arsenic, is produced by a chemical reaction between some kind of pigment and other substances?
Outside the appraisal room!
All the police officers looked at each other in confusion.
They had all studied chemistry, of course, but that was their peak period, the knowledge they learned in high school.
It has been many years since they graduated from college, and the knowledge has long been returned to the teachers.
Among this group of police officers, those who can correctly write the chemical formula of hydrogen arsenide are considered to be very capable.
As for who reacts with whom to produce arsine, they have no idea.
Fortunately, I have a mobile phone!
Many police officers immediately took out their mobile phones to search.
Xu Xinyi stared at the screen and said in surprise:
“There are quite a few chemical reactions that can produce arsine.
But when it comes to pigments...
Is it arsenic sulfide?
Orpiment?"
"That's right, it's orpiment!
It is often made into a lemon-yellow pigment.”
Hearing Shen Ting's affirmation, Xu Xin nodded slightly.
But Xiong Beibei, who was standing next to him, looked at the reaction formula with confusion:
“That’s not right!
In order for orpiment to react to produce arsenic, hydrogen sulfide is also needed as a reactant.
This thing isn't a common chemical, right?!
Where did the hydrogen sulfide come from in that dilapidated cabin?"
“This is easy!”
Shen Ting laughed and said, “Corpse!
The hydrogen sulfide comes from dead bodies.
Bacteria break down the sulfur-containing amino acids in the corpse, and then complex reactions occur, eventually producing hydrogen sulfide.
When hydrogen sulfide reacts with orpiment, it produces arsine.”
Many police officers nodded immediately.
Hydrogen sulfide, they are too familiar with it.
The rotten egg smell at many crime scenes comes from this substance.
Many special changes of corpses, such as transformation into the Hulk, are also related to this substance.
Shao Ming said excitedly: "To sum up!
The three special substances correspond to pigments such as orpiment, Burmese gamboge and shellac.
They are so rare, and they are all pigments, so they are most likely from the same person.
Unfortunately, these three special substances, like the previous three special substances, cannot be confirmed to come from leather workers.
But these three pigments, simply because of their rarity, are also very important and must be the focus of investigation..."
"Well, wait a moment, everyone.
I'll ask a pigment expert.
Who would come into contact with these three raw materials at the same time?
Maybe it can be related to the leatherworker!"
"Team Leader Shao, no need to bother!"
Chen Ting suddenly stopped Shao Ming who was about to contact someone and said with a smile:
“I actually just searched for it.
The key is that the three special pigments have specificity with the cinnabar and beeswax identified previously.
There is only one rare profession that uses these five substances at the same time..."
This moment!
The entire appraisal room suddenly became quiet.
Shen Ting's voice was not loud, it could even be said to be subtle.
But when it fell into the ears of everyone, it felt like a deafening awakening.
"Shadow puppeteer!"
When Shen Ting's last three words fell, many police officers trembled and their eyes lit up.
The leather maker case put too much pressure on the police officers.
The difficulty of investigating is far greater than that of ordinary serial killings, let alone ordinary homicides.
From the very beginning of the case, the investigation ran into difficulties. Everyone felt depressed, as if a huge stone was pressing on their hearts.
Later, Chen Ting found Su Kexin's headless body in the forest.
And confirmed that the murderer is most likely a leather worker.
At one point, the police officers thought they had found hope of catching the leather maker.
However, subsequent exploration, identification and investigation have yielded nothing.
Everyone's hope turned into disappointment!
The stuffy feeling became more and more obvious.
It was like a heavy stone pressing on my chest, getting heavier and heavier.
Until this moment, I heard Shen Ting say the three words "shadow puppeteer"!
The police officers suddenly felt all the pressure disappear without a trace in an instant.
The gloomy feeling vanished in an instant, and many doubts about the leatherworker case became clear...
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