In the courtyard late at night, Kidd used a flashlight to curiously observe the silver-black stone that Makoto Sakaki picked out from the charcoal furnace, but he couldn't recognize it for a while.
"This looks like some kind of metal..."
"It's the second most abundant element in the Earth's crust, atomic number 14, a metalloid in the third period of the element table, silicon."
Sakaki Makoto said with a cold look.
"silicon...."
Kidd frowned and thought hard, then suddenly his body shook and he realized:
"It's silicon dioxide? The criminal actually used silicon dioxide to produce carbon monoxide?!"
"That's right."
Sakaki Makoto nodded:
"Silicon dioxide is a naturally occurring white crystal that is widely found in nature. Natural silicon dioxide is also called silica and is mainly used to make glass, pottery and other items. Pure silicon dioxide crystals are also often used to make optical instruments. Generally speaking, it is not rare and it is very easy to obtain."
"When carbon and silicon dioxide react at high temperatures, they produce silicon and carbon monoxide. This is the source of the high concentration of carbon monoxide in the room. The prisoner is obviously proficient in basic chemistry..."
"But..."
Kidd said doubtfully:
"Although silicon dioxide and carbon can react, the temperature required is very high, between 600℃ and 800℃, and it seems that a closed oxygen-free space is also required!"
"Are you so bad at chemistry? Sealed oxygen-free spaces are used in industry to produce corundum, which can also produce carbon monoxide. But in an oxygen environment, the reaction produces silicon and carbon monoxide!"
Rolling his eyes, Sakaki Makoto explained:
"As for the temperature issue you mentioned, anyone with a little common sense knows that in an open fire, the temperature of carbon can reach 700°C, and the semi-enclosed bellows furnace used by blacksmiths can reach 900-1000°C! In ancient times, people used charcoal to make steel, and it takes 1000°C to melt pig iron! It is completely enough to melt silica!"
"My major is not chemistry..."
After muttering something, Kidd said:
"I never thought that the criminal would use this method to purify carbon monoxide. It's amazing that he could come up with such an invisible way of killing people!"
“Not only that, he also knows how central air conditioning works.”
Sakaki Makoto said quietly:
"Most central air conditioners have ducts that are not interconnected, so it is impossible to draw air from the outside. Generally, the air is circulated inside and heated or cooled through the indoor unit."
"The central air conditioner used by the Ogawa family is equipped with a fresh air system. This system connects the pipes in each room to achieve the effect of purifying the air. I was careless. With insufficient information, I didn't react in time..."
Sakaki Makoto was a little annoyed. With his ability, he shouldn't have made such a low-level mistake. He didn't even think of the air circulation system until he saw the air conditioning controller on the wall....
If he had paid more attention to the central air conditioning, perhaps this tragedy could have been avoided!
Picking up the charcoal stove used in the crime, Makoto Sakaki took Kid back to the house and took off his mask.
After such a long period of ventilation, the residual amount of carbon monoxide in the room is no longer enough to cause poisoning, so you can rest assured for the time being.
"Based on this situation, the chefs are the most likely suspects."
Kidd sat down and said:
"They had easy access to coal, so it would have been very easy for them to carry out the assassination. It would have been effortless."
"As long as the concentration of carbon monoxide in the air reaches 1% it can be fatal, so it doesn't take much time..."
Sakaki Makoto pondered and said:
"But it would be a bit rash to say that the chef is a criminal just based on this."
Suddenly, a shrill siren sounded outside the house, accompanied by red and blue flashing fluorescence. Sakaki Makoto and Kidd raised their heads at the same time, a hint of surprise flashed in their eyes, and asked in unison:
"Did you call the police?"
“........”
Neither of them called the police, but the police arrived at the scene, which was beyond their expectations.
Could it be that the police in Gunma Prefecture have such a keen sense of smell that they can predict the future?
Walking out of the house, Sakaki Makoto saw several figures getting off the police car. The leader had a middle-parted hairstyle and a wise look in his eyes.
I knew he was very smart.
The kind that has a gambling element to it.
Gunma Prefectural Police Chief—Yamamura Sou!
"It's over."
Sakaki Makoto covered his face with his hands and groaned:
“It turned out to be this guy…”
Kidd also had a desperate expression on his face, obviously having seen Yamamura Sou's strength.
"Didn't we solve a murder case in Fujimi Village before you came?"
Kidd looked up at the sky, looking hopeless and said:
"Originally, the case could have been solved quickly, but with Shancuncao's full help, it was delayed until the middle of the night. We had to take the time to explain the inside story to him..."
At this moment, Shancuncao strode over under the light of the police car headlights, first showed his ID, and then asked:
"We received a report that a premeditated murder occurred here. Are you two the culprits?"
“........”
"Inspector, inspector, why would the criminal just stay there and wait for the police to catch him?"
Behind him, a police officer with a high IQ whispered:
"They should be the survivors of the crime scene!"
"Oh yes, yes..."
Shancuncao slapped his head and laughed foolishly:
"Where is the prisoner?"
Sakaki Makoto and Kidd looked at each other, feeling extremely desperate.
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