"I've seen it for a long time, I really haven't studied this." Dong Bingning wrote as she spoke.

This time, without waiting for Dong Bingning to ask, Ye Yinuo continued: "When the dry ice melts, it will solidify the water molecules in the air, forming a layer of water mist, and the water mist will attach to the outer packaging and furniture of those cosmetics, and it will form a thin layer of water vapor, the water vapor is very thin, and it will dry soon, because the door of this room is tightly closed, so it will leave traces, in order to make it cleaner, everything here has been wiped, but the wiping is very rough, because Song Keer still needs to put those things neatly, and there is not much time, So she had to die before the dry ice could be completely sublimated. ”

After Dong Bingning finished writing, he looked up at Ye Yinuo and asked, "Because the carbon dioxide released by dry ice squeezes out and compresses the oxygen and water molecules in the air, the relative humidity in the air will be lower than outside, right?" ”

Ye Yinuo snorted and said, "That's right, there is another role." ”

"What is it?"

"The higher the concentration of carbon dioxide in the air, the more likely it is for Song Keer to suffocate." Ye Yinuo said casually.

Dong Bingning nodded, sorted out his thoughts after writing, and said: "But this is all our speculation, there is nothing left after the sublimation of dry ice, which cannot be used as evidence." ”

"You can visit the units around that have dry ice for sale, there are not many uses of dry ice, there are generally records, and you can get the sales record as evidence, and the dry ice is not without traces after sublimation, and the furniture and those things that have been wiped can be used as evidence." Ye Yinuo explained.

Dong Bingning snorted, and suddenly looked at Ye Yinuo with some admiration and said, "You are so powerful, you can speculate so many things just by taking a look." ”

"Hehe, I'm sharp-eyed." Ye Yinuo laughed dryly and muttered in a low voice: "Song Ke'er committed suicide, why did you pull me into the water?" ”

Dong Bingning was also silent for a while, and she said, "Could it be that the suspect did it?" According to what you said, the suspect can stun Song Keer first, and then do those things, which can also achieve this effect. ”

Ye Yinuo shook his head and said: "Song Ke'er's death must have something to do with that person, but it wasn't that person's doing, dry ice does not have the process of melting from solid into liquid and then volatilizing into gas, it is directly sublimated from solid to gas, the speed is very fast, and the temperature will rise quickly, if Song Ke'er does not die before the temperature rises, then it will not play a role in misleading the time of death, not to mention, it is impossible for him to have the opportunity to wipe the furniture and those objects after killing Song Ke'er." ”

"Well, that makes sense." Dong Bingning suddenly opened his mouth and said: "This is a major discovery, I have to tell Team Wang and ask for credit for you." ”

Ye Yinuo waved his hand and said, "I'm not within the scope of the compilation, what credit do you ask for me?" Besides, if Team Wang knew that you brought me to the scene of the crime, you wouldn't be able to eat and walk around. ”

"It's all about solving the case, it's nothing, I can make up for it." Dong Bingning said.

"Don't say goodbye, just say it's your speculation, they'll be more acceptable." Ye Yinuo refused, seeing that Dong Bingning was still hesitating, Ye Yinuo continued: "We are just cooperating with the police and the people, you have to help me keep this secret, I still feel that this case is coming at me, I can't expose it too early, and it is not conducive to future detection." ”

If Ye Yinuo had said this before, Dong Bingning would definitely not take it seriously, but now, she gradually began to favor Ye Yinuo, thinking that what he said was not unreasonable.

Dong Bingning didn't agree, but smiled and said with a wicked smile: "You said before that Nokar's law of material exchange, that the suspect will definitely leave something at the scene of the crime, although the murderer is not a suspect, then what clues do you have left?" If you can find a difference after our technical team has done an inquest, then I promise you to help you keep it a secret. ”

"Hehe, you're really going to take advantage, do you have a magnifying glass?" Ye Yinuo said with a smile.

"Yes, the technical team's survey has not yet been completed, and some of the most basic tools are still there." After Dong Bingning finished speaking, he picked up a toolbox next to him, took out a magnifying glass and handed it to Ye Yinuo.

Ye Yinuo didn't answer, but stood up and said, "The magnifying glass is for you, come with me." ”

Dong Bingning followed Ye Yinuo into the bedroom again, Ye Yinuo pointed to the wall and said, "Did you find any dust in the corner?" ”

"Huh?" Dong Bingning walked to the corner, nodded and said, "There are indeed ones, but there are very few, and then." ”

"Song Ke'er was very short of time when she was cleaning the room, and she didn't have time to sweep the dust out, so she swept it all to the corner." Ye Yinuo said.

Dong Bingning snorted: "It's not strange at all, you don't think that this dust was brought back by that suspect, right?" ”

"No, this dust is not simple dust, you take a magnifying glass and look at it, compared to ordinary dust, some of it is very white, and some of it is very black." Ye Yinuo said.

Dong Bingning nodded, looked at it with a high-powered magnifying glass, and then said in amazement: "Pervert, you can find this, this is indeed the case, but what does this mean?" ”

"Dust is often the most easily ignored detail in the investigation, because there are too many possibilities, and it is impossible to distinguish at all, that is to say, your technical team will basically ignore it, and even in the ordinary on-site investigation class, there will be no knowledge about this aspect of the knowledge, and in the process of solving the case, these details can often play a key role."

"Well, tell me, what does this black and white dust represent?" Dong Bingning seemed to be a little anxious to know.

"Incense ash, and sandalwood incense ash." Ye Yinuo pointed it out directly, and sighed secretly in his heart, although this Dong Bingning stretched out his hand, his ability to inspect the scene was very ordinary.

"How?"

Ye Yinuo explained: "There are many kinds of incense for worship or worship on the market, some are directly made of wood powder and pine cone shell, the price is very cheap, the incense ash after burning will be black, and some are made of water sinkingwood, because there are more water molecules in the water sinkingwood, the incense ash is gray, and there is also a sandalwood incense, the material of sandalwood incense is generally the cheaper sandalwood in sandalwood, sandalwood is also called white sandalwood, and the incense ash after burning is white. ”

"It's not just sandalwood that can burn white ashes, right?" Dong Bingning said with some suspicion.

"You are really big-chested and brainless...... Ye Yinuo complained, and then found that this sentence was a little inappropriate, while Dong Bingning was not angry, Ye Yinuo hurriedly said: "The white ash is the product of sandalwood burning, and the black ash is the product of the burning of the incense stick, the incense stick is generally made of bamboo, which is very tough, and has a bamboo charcoal component after burning, so it is black, there is black and white, it must be the incense ash of sandalwood, you can send it to the technical team for identification, I have seen Song Keer's sole, there is no trace of incense ash, There was also no altar or shrine in this room, which was left by the suspect. ”

"How is it so sure that the suspect left it? If you can leave incense ashes, why haven't you found footprints? ”

"Of course it was cleaned up."

"Could it be someone else?"

"No, in the past three days of surveillance, only the suspect has been here, and this incense ash will oxidize and turn gray after more than three days, and it is not so white."

"Awesome!" Dong Bingning said in admiration, and smiled playfully: "Great God, let's see if there are any other clues?" ”

"Not for the time being, a lot of physical evidence should have been taken away by you, and that's all I can investigate." Ye Yinuo walked out of the bedroom as he spoke, took off his gloves and hood, handed them to Dong Bingning, then looked at his watch and said, "It's not early, I'll go back and rest." ”

"Go back? Didn't you apply for protection? You should stay here with me, and you've said yes yourself. Dong Bingning hurriedly said.

"Yes, you've been protecting me for a while, I don't need it now, I actually have a suggestion."

Dong Bingning looked at Ye Yinuo suspiciously, and motioned for him to continue.

"What's the point of you protecting the site?"

"Of course, I'm afraid that others will destroy some clues that haven't been surveyed yet." Dong Bingning said.

"Who's going to spoil the clues?"

"Someone involved in this case, of course."

"He is also the one you are looking for, and if you have someone to stay here, he will not come, and since you have no trace of him now, why not lure him in?" You just have to go to the monitoring room and stare at it. Ye Yinuo said directly.

Dong Bingning nodded: "It seems to make some sense, but this is not in line with the case handling procedures, and the suspect will basically not come." ”

"The program is dead, the person is alive, sometimes, if you change it, there may be unexpected gains, not to mention that you also said, he basically won't come, you are pulling the cordon, and no one will come in, in fact, there is no need to protect the scene." Ye Yinuo said as he walked towards the door.

Dong Bingning chased after him in two steps, and said in his mouth: "The last two questions, you can leave after you finish answering." ”

"Are you finished?" Ye Yinuo glanced at her, and already knew what she was going to ask in her heart.