The investigations of both parties have made phased progress at the same time, which should be a gratifying thing.
But this double progress did not bring double excitement, but instead endless emptiness.
Because whether it is the sodium carbonate found by Tang Ze or the alibi of Yamamura Ying found by Detective Yumio, they all point to a criminal with professional knowledge.
This means that when Tang Ze was interrogating the movie queen Yamamura, his inference that she was telling the truth and was not the criminal was confirmed.
Although this guy is a potential pleasure criminal, he is definitely not a criminal.
Of course, although we cannot arrest someone just because he has dangerous thoughts, necessary follow-up is still necessary.
After exchanging information with the other party, Tang Ze reminded Inspector Yumio to send people to pay more attention to the other party, and then hung up the phone.
"What are we going to do next?"
After seeing Tang Ze finish the call, Gao Mu said with some distress: "Although we know that the fire was caused by a substance containing sodium carbonate, and the suspect is also likely a professional.
But there are so many qualified candidates that we don’t even know where to start.”
"We can gradually eliminate the suspects, but for now, we should start with the channels."
Tang Ze thought for a moment and said, "After all, even if the fire was caused by sodium carbonate, it's impossible that all the substances involved are the same.
If we can find the same source of fire as the samples we collected, we can identify the source and narrow it down to a certain extent.”
"Sodium carbonate isn't something that's so easy to come by." Gao Mu suddenly realized, "Starting from this aspect is indeed a good idea."
"Actually, it's quite simple for professionals. As long as you have some kind of acid and glycerin, you can make nitroglycerin."
Tang Ze said: "For example, 50% of the ingredients in enema are glycerin, which can be said to be something that is easy to buy.
We will go to the drugstore later and buy all the enemas on the market, and then compare them with the sodium carbonate we have after experimenting.
As for acid, which is not so easy to obtain, it seems that the prisoners already have it on hand, so we can just use a few common acids as a substitute."
"So, I have to trouble Mr. Saito again?"
Hearing this, Gao Mu looked at Tang Ze and said, "You just said to let him rest. Are you planning to let him take on this huge workload?"
"That's not the case." Tang Ze waved his hand and said, "Such a simple comparison task can be handed over to our subordinates. Let's go buy an enema first."
After traveling around Tokyo with the funds and buying up all brands of enemas, the two returned to Kesouyan and began to exploit the labor of their employees.
Fortunately, the scientific research institute is now operating well, and its advanced technology provides good logistical services to the Metropolitan Police Department, and personnel are being recruited one after another.
In addition, the task was personally assigned by Tang Ze, the immediate superior, so the efficiency is still very high.
The exhaustive method, coupled with the human wave tactics, quickly produced results, but disappointingly, the various combustion residues they tested were completely different from those at the fire scene.
Although sodium carbonate is indeed produced, the other trace impurities are completely different.
These trace impurities are equivalent to a "fingerprint". Only when the same substances are fused and burned can basically the same impurities be obtained.
Without this impurity, it is equivalent to the prisoners not using these things to make nitroglycerin.
"So it wasn't nitroglycerin that caused the fire?" Takagi said somewhat disappointedly after getting the results of this large-scale experiment.
"No, the general direction is correct."
Tang Ze shook his head and said, "But we still don't know the specific manufacturing materials. This is both a good thing and a bad thing."
The good thing is that the prisoner used special materials to make nitroglycerin. If we can find them, we can directly identify the prisoner.
But the bad news is that this is like looking for a needle in a haystack. If you can't find the special materials, you can't even start.
As expected, even though Tang Ze finally asked Saito Hiroshi to think about it together, he still couldn't figure out what special materials the criminal used to synthesize nitroglycerin.
And this kind of thing should be very common.
For example, although chemistry teachers can easily come into contact with acids that can synthesize nitroglycerin, these things are strictly managed in schools.
If you don't want to be discovered, you can only use things that are easier to get.
With full of doubts in his heart, Tang Ze returned home.
"You're back! My aunt sent some crabs from Hokkaido today. Let's have this for dinner."
As soon as he entered the door, Tang Ze saw Ayako busying herself. He also put down his work and walked into the kitchen with a smile: "Crab, it's really good. I haven't eaten it for a long time."
"My aunt told me that they are all refrigerated right after being freshly caught, and then sent here urgently." Ayako said with a smile.
"But why was I the last to know about this?" Tang Ze glanced at the king crab in the foam refrigerator and said speechlessly.
"It proves that I'm the boss at home." Ayako said proudly, "You no longer have a say!"
"Everything else is fine, but once we get into the bedroom, I have the final say."
Tang Ze smirked and reached out to hug Ayako, but she slapped him away with an eye roll: "All you do is think about that all day long. You haven't even eaten yet."
"Okay, let's eat." Tang Ze said with a smile, "I'll go change my clothes and come over to help later."
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