Zhou Lingwu carefully looked at the place where the footprints appeared, and then he found that there were faint red particles on the frosted floor, which were difficult to see with the naked eye. Pen & Fun & Pavilion www.biquge.info

Zhou Lingwu boldly guessed that these red particles would be wiped away blood?

Thinking of this, Zhou Lingwu immediately got up to look for the forensic comrades who were still working at the scene, under his hard search, the hard work finally paid off, he found the elderly forensic doctor who was solving in the corner of the garden, the scene at that time was inevitably a little embarrassing, Zhou Lingwu was not easy to say anything, but the old forensic doctor kept explaining, he said: "Ah, that! It's not like you see, I can't destroy the scene, it's a last resort! ”

Zhou Lingwu waved his hand again and again when he heard this, saying that he didn't see it and didn't want to remember it.

The old forensic doctor always felt a little awkward when he was seen untying his hands, and he quickly sorted out his clothes after solving the internal emergency, and then asked, "What's the matter, do you have anything to do with me?" ”

"I'd like to borrow your luminol for a while." Zhou Lingwu glared and said.

When the old forensic doctor heard this, he realized the seriousness of the problem, and he said, "What's the matter, Zhou Lingwu, have you found any major clues?" ”

"Tsk." Zhou Lingwu knew that after he said the name of the preminol reagent, he would lead to this kind of consequence, but if he wanted to continue his investigation, he could only let this old forensic doctor follow him, who would not have this kind of reagent, he smacked his lips, and then said: "Come with me." ”

The old forensic doctor offered to wait a moment, and he said that he would go back and get the toolbox, and then gather in the hall.

When Zhou Lingwu heard this, he had no choice but to do what the old forensic doctor said, who called people to have goods?

After about ten minutes or so, Zhou Lingwu saw the old forensic doctor running over in a hurry with a toolkit, and he saw Zhou Zhoulingwu waiting in the center of the hall hurriedly waving his hand. Zhou Lingwu waited for this stranger for ten minutes, and he was already impatient, but because he was a senior, and he still had the medicine he urgently needed in his hand, Zhou Lingwu was not angry with him, he just waved his hand and motioned to the old forensic doctor to follow him to the scene.

The two of them took three steps and made two steps, trotting all the way to the side of the stairs, Zhou Lingwu pointed to the second step closest to the door frame and said to the old forensic doctor: "What do you think this is?" ”

When the old forensic doctor heard this, he took out a pair of reading glasses from the chest pocket of his white coat, he frowned and squinted his eyes and stared at the steps in the direction of Zhou Lingwu's finger very carefully, and after about a minute or so, he said in surprise: "Isn't it?!" ”

"That's right, let's do it." Zhou Lingwu nodded and said.

The old forensic doctor turned to his previous old appearance, and he took out a small tube of reagents from the cowhide briefcase he carried with him. The test tube contained pale yellow powder, and the old forensic doctor opened the sealed lid and spread the pale yellow powder little by little on the steps of Zhou Lingwu's fingers.

Over time, blue fluorescence appeared under the original pale yellow powder, and these blue fluorescences appeared little by little, not directly (remember here, the principle will be explained later).

"Blood!" The old forensic doctor and Zhou Lingwu said in unison.

Zhou Lingwu and the old forensic doctor paid close attention to the color changes on the steps, and under the careful observation of the two, Zhou Lingwu found that these blue glittering places actually showed a pair of footprints.

Speaking of which, we have to explain what luminol reagent is, which is a synthetic organic compound, also known as luminescent ammonia. It is possible to identify blood stains that have been scrubbed and have been long ago. It is a yellow crystal or beige powder at room temperature, and is a relatively stable chemical reagent.

This chemical emits blue light when oxidized. Blood contains hemoglobin, which transports the oxygen we breathe from the air to all parts of the body. Hemoglobin contains iron, which catalyzes the breakdown of hydrogen peroxide, turning it into water and monooxygen, which re-oxidizes luminol to make it glow. This detection method is extremely sensitive, can detect only one part per million of blood, even a small drop of blood into a large tank of water can be detected, understand the truth of luminol glow, you will know that this detection method is not so reliable,

However, since luminol glow is caused by oxidation, it means that there are many oxides and metals that can act as catalysts to make luminol shine, including the hypochlorous acid bleach used daily. If criminals have cleaned the scene with bleach, there is a risk of interfering with the use of luminol. There is a slight difference between the two types of glows, where the glow caused by bleach is a rapid flash, while the glow caused by blood stains is gradual. That's why I said earlier where to remember when blue appears.

Once we've figured out what luminol is, and how it works, let's get down to business.

Zhou Lingwu found that the blue fluorescent traces on the building showed the nature of a human footprint, and through the previous blue form, it could be known that this was a bloody footprint.

Under Zhou Lingwu's careful observation, he found that there was no shading on the sole of the shoe, which showed that the murderer did not enter the scene wearing shoes to commit the murder, but carefully observed the toes in the footprints, the toes were not five single individuals, but a whole piece of blood, which shows that the murderer was not barefoot, so how can such footprints be left, yes, it is socks, the murderer entered the house wearing socks, This also indirectly shows that the murderer's murder was deliberate for a long time, not improvised, which couldn't help but make Zhou Lingwu put the suspicion on Zhu Ben's person, could it be that Zhu Cheng committed the crime himself but the thief shouted to catch the thief?

But now is not the time to speculate, after all, the evidence is lacking enough to confirm the suspect's information.

Zhou Lingwu found that the shape of the front edge of the forefoot of the footprint is straight, and the shape of the inner and outer edges of the forefoot is arc, with no significant characteristics, which are the common footprint patterns of ordinary people.

Based on the footprints, Zhou Lingwu preliminarily inferred that the arch of the murderer's foot should be moderately arched, because the inner edge of the arch at the narrowest part of the footprint exceeded the range of the narrow arch, but did not exceed one-half of the distance from the center line of the footprint to the inner edge of the plantar and the tangent line of the inner edge of the heel. (To be continued.) )