Pokémon: I'm a detective, not the sixth one.

"Captain Lin, look at this."

Lu Yi called Mr. Dalin over. He didn't dare to confirm what was stuck under the fragments, and he didn't want to arbitrarily destroy the original placement of the items.

Mr. Dalin glanced at it and recognized based on experience that it was the black substance left after the gel material was burned. He didn't pay much attention to it at first.

But he blinked, seeming to remember something, and then knitted his brows tightly into a ball, squatting next to Lu Yi.

"This thing is interesting. Let me take it off first."

Dalin took out a folding knife from his pocket, held the fragments in one hand, and cut repeatedly at the bottom of the black object where it was connected to the floor with the other hand, and it took a lot of effort to cut it off.

Picking up the fragment, Mr. Dalin approached it and observed it carefully, and then gave instructions to Lu Yi's Kati dog and Chirulian respectively.

"Kirulian, use your mind to levitate this fragment in the air, and be careful to stay away from the surrounding wooden furniture; Katie Dog, use sparks to heat this fragment until the black object melts."

After hearing the order, the two little guys immediately cooperated and started their work.

Kirulian's eyes burst out with green light, and the eyes of everyone around him also followed the rising of the fragments. The Kati dog was wagging its tail below, constantly burning the black objects with sparks.

After a while, the glass bulb fragments made a crisp sound first, cracks appeared visible to the naked eye, and then gradually became twisted and slightly deformed.

Afterwards, the black object also turned into a soft and waxy state, no longer fixed in shape, but like dewdrops on the surface of plants in the morning, slowly dripping down in the shape of water droplets.

"Clap."

The black object, no, it should be called black fluid now, dropped heavily on the floor, and then quickly dried and solidified, turning into a hard lump that was difficult to pick off.

Mr. Dalin gestured to the two elves, indicating that they would stop here. He had verified his suspicion.

"It is indeed a gel-like substance with good temperature resistance, and its melting point is even higher than that of glass."

After hearing Mr. Dalin's conclusion, Lu Yi blinked in disappointment.

"Team Lin, is this just gel? I thought it was the dirt left by Pokémon like Stinky Mud. I've been waiting in vain for a long time..."

Hearing this, Mr. Dalin smiled. He knew that Lu Yi was hoping that the thing in front of him could be related to the criminal in the theft case. But he still showed a meaningful expression and announced a piece of good news to everyone.

"It doesn't matter. Even if it doesn't directly prove the connection between the two cases, at least I already know the arsonist's criminal methods."

"Huh?!" Hearing this, everyone's eyes lit up!

Mr. Obayashi reached out and took the light bulb fragment handed over by Kirulian, and pointed the black gel part toward everyone.

"It's this gel. The criminal applies the gel to a certain area of ​​the light bulb, and then connects the power source to make the light bulb start to glow and heat.

Under the continuous output of power, the bulb will quickly become hot to the touch, and this is a cheap bulb with poor material and poor heat resistance and heat dissipation.

But as you just saw, the quality of the light bulb is poor, but the heat resistance of the gel is not bad! Under its adhesion, uneven heating will soon appear on the surface of the bulb. Coupled with the thermal expansion and contraction of the glass itself, the thermal expansion of the area tightly sealed by the gel is severely limited. No matter how small the expansion is, it will definitely have an impact on the bulb itself!

As a result, inferior light bulbs bear the pressure of uneven surface temperatures and blocked expansion, and will explode after a period of time! "

Lu Yi couldn't help but feel shocked after hearing Mr. Dalin's analysis, but he still had a few questions that he needed help from his seniors to answer.

"Team Lin, are you sure that the gel was attached to the surface of the light bulb from the beginning? Why did the murderer choose the study room on the second floor as the detonation point?"

Mr. Dalin looked at Lu Yi and showed a determined smile.

"Originally I was unsure, even when you asked me to observe the fragment just now, I didn't pay much attention.

But I suddenly thought of a sequential issue. Not to mention where the gel came from, assuming it originally existed in this room and was a tool used to glue certain pieces of furniture together, there would be a big loophole.

The fragments of the light bulb are stuck to the gel on the floor. Doesn't it mean that the gel needs to explode and melt here before the light bulb?

This is not consistent with the logical facts of the explosion site, nor is it consistent with the ordering of melting point temperatures of gel and glass. We have launched an accident inspection report. It was the light bulb that burst first, causing an electric spark, which ignited the high concentration of gas and formed a 'thermal chain reaction', eventually blowing up the entire house.

Therefore, this piece of gel could only fly away together with the glass, and then gradually melt in the fire. After the fire was controlled, it stuck to the floor again! "

When Lu Yi heard this, he showed a "teachable" expression and listened very carefully the whole time.

Mr. Dalin continued his analysis: "As for what you said, why the criminal chose to start the fire in the study room on the second floor, I guess it may have something to do with the concentration of gas and the current power of the desk lamp.

The mass of gas is slightly lighter than air. It spreads from the kitchen on the first floor and slowly spreads upward. After a period of accumulation, the concentration on the second and third floors will definitely reach a level that is flammable in case of fire.

The desk lamp in this study room plays a role in delaying the explosion time of the light bulb. Generally speaking, desk lamps have lower power than household headlights because they are only responsible for lighting a certain area, while headlights can illuminate the entire room.

If this bulb is installed on a headlight, the ultra-high power will cause it to heat and expand rapidly, and it may explode long before the gas fills the entire house. "

After hearing this, everyone has a clear idea of ​​many details of this case. It seems that Mr. Dalin's inference is completely in line with the truth!

"Okay, although we now know this person's modus operandi, there are still many doubts about the case itself. At the very least, we can't even identify the suspect, and there is no direct evidence to prove the identity of the criminal!"

Mr. Dalin said, giving instructions to several police officers beside Lu Yi.

"You guys, first go to a nearby store to look for these low-quality light bulbs, then buy a tube of gel, take it back to the Alliance Building and test it with a desk lamp to see how long it will take for a natural explosion to occur."

Upon hearing the order, several police officers saluted and quickly left the villa.

Dalin looked at Lu Yi and Baidi again.

"You two come with me. Let's do another test to see how long it takes to drive from here to the jewelry store in the north."

After saying that, Mr. Dalin turned around and left, and Lu Yi quickly followed.

"Are you trying to determine the connection between the two cases?"

"Yeah." Dalin nodded. "Remember what I told you? The criminal in that theft case in the north was the owner of a hardware store."

Lu Dun's eyes suddenly lit up.

"Oh! Yes! I'm still shocked by your reasoning just now, and I almost ignored such an important thing!"

Lu Yi was enlightened by Mr. Dalin. Isn't that the owner of the hardware store very familiar with inferior light bulbs and heat-resistant gel?

This person's suspicion of committing the crime is getting bigger and bigger. If the delay of the explosion of the light bulb is roughly the same as the time spent on this journey, then the next task may be that the police team will need to carefully search for the traces he left in the villa. To prove that he had been here before the crime!

……