Kiyoshi Matsumoto has been the managing officer of the Metropolitan Police Department for many years, and every officer is respectful to him, even Twilight, who has now been promoted to the position of the police department, is a little reserved. But there are only two situations in front of me, the forensic doctor who came back from studying in the United States, who is so confident and honest in front of himself that he wants to say and do.

One is that he is a stunned young man with little social experience, and it is good to have some energy, but he is very blind to add to the chaos. On the other hand, you really have a certain ability to do things that are in line with this confidence.

Obviously, Tong Guò's praise during this time, as well as his cousin Xiàn, the forensic doctor named Ogata, should be a capable young man.

"Okay." A smile appeared under Matsumoto Kiyocho's stern face, and he nodded: "You are the forensic doctor who is rumored to help search a department that has repeatedly solved cases, and I will look at the next table." ”

Ogata nodded slightly, his gaze turning to the crime scene where there was no body, this subjective reference. All the police officers in the forensics department are trying to search for relevant evidence, and they dare not be careless in every detail, because the matter is related to the relatives of high-ranking figures.

It is true that in the absence of a corpse, the forensic doctor has very little room to wield, but one thing is not wrong, the crime scene and the victim himself will reflect the whole process of the crime.

"Brother Ogata, you are a forensic doctor after all, and meddling in such a case will affect your future." Twilight walked over to Ogata at this time and whispered to him.

Ogata looked at Twilight gratefully, knowing very well what the top boss's words meant. Originally, he had already received the news that he was going to be promoted, and if he messed up the case of Matsumoto Kiyoshi's eldest daughter this time, it would be easy to lose the opportunity that had been set in stone.

"The police department, in fact, even if the victim in this case is not the daughter of the Matsumoto police officer, I will intervene." Ogata smiled and replied lightly.

Twilight looked at him incomprehensibly, because he had always thought that Ogata was a smart person, but today he was talking nonsense. Both he and Matsumoto Kiyonaga himself saw his meddling in the case as an opportunity to be greedy.

Ogata recalled Sayuri Matsumoto's happy smiling face and the white and holy wedding dress, and said with some emotion: "In this life, people always have to think about it." And the most touching and memorable moment in a woman's life may be this wedding. The murderer stained the bride's white wedding dress with blood, imprinted the pain of death, and shattered the beautiful part of the memory"

"If I need a reason, I hate it when murderers take advantage of other people's happiness as a price to secretly laugh." Ogata's gaze looked around at the suspects who were taking notes, and clenched ten fingers.

Twilight listened to Ogata in astonishment, neither fast nor slow, and the thoughts that seemed to be buried in his body became more and more clear and exciting. He reached out and patted Ogata on the shoulder, and after a long time, he just smiled back.

"What's the deal with that sodium hydroxide?" Twilight suddenly remembered that even though the forensics department had not obtained the test results, he had already judged the chemical composition of the drink in advance.

Ogata pointed his finger at the lemon tea cans that had been wiped back and forth with alcohol swabs by the forensics department, as well as the spilled drink liquid, and explained to Twilight, who was humbly listening, "Police, you carefully observe the color of the lemon tea that is spilled on the ground. ”

"Oh?" When Twilight heard this, her eyes widened and she stared hard at the liquid.

Ogata asked, "Is there any difference?" ”

"Looks a little light, right? It's been a long time since I've touched this drink. Twilight straightened the brim of her hat, coughed, and replied awkwardly.

Ogata nodded, "It's not like, but it's a color change." Because in addition to citric acid, sugar, and some additives, the main ingredient of lemon tea is also something called food coloring. ”

"Could it be that the sodium hydroxide you are talking about has a chemical reaction with food coloring?" As a police officer, Twilight's brain turned quickly.

"That's right! The food coloring of this lemon tea will make the drink itself take on an almost orange-red color, which is very beautiful, and once the pigment has undergone a certain qualitative change, it will make the liquid reflect the most essential hue. ”

Ogata said slowly: "Sodium hydroxide is commonly known as caustic soda, caustic soda, and caustic soda, and it is a prohibited chemical drug stipulated in Japanese law. Because its chemical properties are a strong base with high corrosiveness, it is easily soluble in water and forms an alkaline solution. ”

"One of the main reasons the killer chose sodium hydroxide was because it tasted close to lemon tea and dissolved faster than with tetrovitoxin and other substances. However, when sodium hydroxide is integrated into the liquid state of lemon tea, another qualitative change will occur. ”

"What is it?" Every time Ogata pauses in the middle of his conversation, Twilight can't wait to ask questions, and this time is no exception.

"It's so soluble in water, and that's just one thing. Another point is that sodium hydroxide releases a lot of heat when it is dissolved. These heats, combined with the pH of sodium hydroxide itself, directly destroy the packaging of the pigments, making the color of lemon tea lighter. ”

Twilight looked at Ogata and sighed, "You think of so many things just for a glance?" ”

"Not exactly." Ogata chose to take a step back and replied humbly, "In addition to the analysis using chemical principles just now, there are some experiences that have helped me digest the facts of this kind of poisoning case after being exposed to this kind of poisoning case many times. The test results of the forensic department must be put in place, and my inference is only able to calculate the approximation, and there is a possibility of bias. ”

"Police Department, the results of the test have come out." A police officer from the forensics department holds a freshly printed report and hands it to Twilight.

Twilight's gaze swept over the ingredients of the unwanted drink, looking at the final result of the inference.

"The drink contains dissolved sodium hydroxide." Twilight put down the report and said with a smile on her face.

Ogata asks, "Sodium hydroxide is very hygroscopic, and if exposed to air, it can easily dissolve completely into a solution. So what carries this chemical must be a capsule-like shell and a container that can keep it dry. ”

"Did you find the capsules and containers that Brother Ogata said at the scene?" Twilight was convinced of his words and hurriedly asked the forensics officer.

The police officer of the forensics department hurriedly took out a broken capsule shell collected with plastic tape, which did not seem to have completely dissolved.

"The police department, there are only fragments of capsules collected in this lemon tea, and no relevant containers have been found." The police officer reported truthfully.

Twilight is a little disappointed, if the container is found, maybe the murderer's fingerprints will appear.

Ogata and Twilight talk to each other, and when they walk to the scene of the crime, he sees Conan at this moment, observing the video that Ran recorded with dV in advance with several police officers and Matsumoto Kiyocho.

In the picture, Sayuri Matsumoto's wedding dress is so white and clean.

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