C, H, O, N and some trace elements were also detected.
The key is!
The ratio of carbon, hydrogen, oxygen and nitrogen is consistent with the elemental composition of protein.
So, it was finally confirmed that this was an 'arsenic-protein complex'.
The third special substance is much simpler.
We isolated arsine directly from blood samples."
Shen Ting briefly explained the identification process.
The expressions of the police officers in front of him changed from anticipation and curiosity to confusion, and then to a puzzled look of "What are you talking about?"
Everyone felt that Shen Ting seemed to be chanting a spell, controlling them in place.
Everyone could clearly understand every word he said, but when put together, it felt like a lullaby.
The hypnotic effect is comparable to advanced mathematics!
The only thing everyone understood was that Shen Ting, through responsible identification, finally confirmed that the three special substances were:
Cyclic sulfide crystals!
Arsenic-protein complex!
And arsine!
Xiong Beibei scratched his head: "That does sound very rare."
Xu Xinyi wrote down all three substances in his question book.
She originally wanted to write down the identification method and look up the information after the case was over.
But soon gave up.
Because she found that there were many words in the identification process that Shen Ting mentioned, and she was not sure which one it was.
Zhang Chuanyi said, “Chen Ting, why don’t you help everyone answer this question.
What is so special about these three substances?"
Shao Ming beside him nodded repeatedly:
"Yeah yeah!
It would be best to focus on whether the three special substances are related to the case.
If so, what is the specific relationship?"
Shen Ting also realized that what he had just said was commonplace for him who had only a small amount of physical evidence.
But for everyone, it is too professional.
He said directly:
"Then I won't keep you in suspense and will directly state the conclusion.
These three special substances are derivatives of pigments used for coloring.
The first, cyclic sulfide crystals, comes from a yellow pigment—
Before use, Burmese Garcinia resin needs to be fumigated with sulfur to fix the color.
After fumigation, the garcinia resin will produce this special "cyclic sulfide crystal" over time.
The second special substance, an arsenic-protein complex, comes from a purple-red pigment.
Since this substance contains protein, we can naturally use proteomics to trace its origin..."
Shen Ting paused, looked at everyone's confused expressions, and explained:
“In simple terms, the proteome is the complete set of proteins expressed by an organism, a cell, a tissue, or a DNA sequence.
There are obvious differences in the protein groups expressed by different species.
Even within the same species, the proteome expressed may differ at different developmental stages or in different environments.
Proteomic tracing is to trace the type, evolutionary relationship, and origin of biological samples by analyzing specific proteomes, especially analyzing their specificity..."
Seeing the police officers’ eyelids, Shen Ting started fighting again and quickly stopped:
"Well, anyway, Director Ma and I used proteomic tracing to find that the protein in the complex came from lac insects.
This is a resource insect.
During the growth and development process, female lac insects secrete lac through the lac glands on their body walls.
Shellac has a wide range of uses!
When mixed with arsenic and other substances in a specific proportion, it can form a purple-red pigment.
That's what we identified, the arsenic-protein complex."
The police officers nodded repeatedly after hearing Shen Ting’s explanation.
Even Director Dama, who had been following Shen Ting for the appraisal, was the same.
Although he had seen the identification results a long time ago, these special substances were very rare and their sources were little known.
He just found out after listening to Shen Ting’s explanation.
While marveling at Shen Ting's knowledge reserves, he also frowned slightly:
“Brother Shen, you just said that the three special substances all come from pigments.
Arsenic-protein complexes and cyclic sulfide crystals do indeed.
But this third special substance, arsine, isn't considered a pigment, right?"
“It really doesn’t count!”
Shen Ting nodded and looked at Director Dama.
He is indeed a professional, and his understanding of special substances is much better than that of ordinary police officers.
Shen Ting explained:
"The production of arsine is different from that of the previous two special substances.
The first two special substances are produced when the pigment is naturally placed or prepared.
Arsine should be produced by the reaction between pigments and other substances..."
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