Breaking Through The Clouds

Chapter 134

Crazy joy and extreme pain

Han Xiaomei was hiding outside the corridor. She looked around furtively and finally sneaked into the trace inspection department while no one was paying attention.

A few minutes later, with a bag on her shoulders and her hands in her coat pockets, she walked out of the Municipal Public Security Bureau in her high heels with her head held high.

The hour hand was close to 12 o'clock. Yan Xie, who was sitting in the living room, suddenly raised his head, and the next second, the doorbell rang.

"I was scared to death. When I came out, I ran into Director Gou, who was working overtime. He asked me why I went to the trace inspection department in the middle of the night. I had to say that I forgot to submit the inspection box I brought to the scene yesterday, so I sneaked over at night to submit it when no one was there!" Han Xiaomei took several bottles and spray bottles out of her bag one by one, and said without tears: "Director Gou scolded me a few times; what if he tells Captain Yu? My great career has just begun; will it be marked with a stain?!"

Yan Xie said nothing. He went to the kitchen to get half a cup of distilled water, put on trace inspection gloves when he came back, mixed the powder of luminol and potassium hydroxide with water, and poured it into a spray bottle filled with hydrogen peroxide.

"Brother Yan, what the hell are you doing?" Han Xiaomei finally felt scared belatedly and asked in a low voice, "You...you cut your wrists at home and got blood on the ground?"

"......"

Yan Xie looked at her up and down, came to the door of the bathroom, and took a breath.

Han Xiaomei followed on her tiptoes and saw Yan Xie take a spray bottle and spray dozens of times on the floor, corners, and washbasin. Then he exited the bathroom and turned off the light.

"Huh-" Han Xiaomei covered her mouth.

The washbasin in the darkness was dotted, and a palm-sized patch of faint blue-green light slowly lit up on the ground, which was a blood reaction!

"Do you know what this is?" Yan Xie asked.

"I-I-I didn't see anything, I don't know anything!" Han Xiaomei covered her eyes with both hands: "Captain Yan, Brother Yan, Lord Yan! I beg you, I promise I won't say anything after I go out! "

"You should have learned in your police academy textbooks that luminol solution, when catalyzed by iron ions in the blood, emits blue light after oxidation. Therefore, it is used to detect bloodstains at crime scenes. But if there are other strong oxidants present at the scene, luminol still emits light, so if you use hypochlorous acid bleach or excrement to smear the scene, the strong fluorescence will interfere with the criminal investigators' judgment on the bloodstains."

"W-we-we have memorized it before," Han Xiaomei said tremblingly, "The strong fluorescence catalyzed by hypochlorous acid lights up very quickly, and the fluorescence catalyzed by blood iron ions lights up slowly, which can be differentiated by taking pictures..."

"But what we used to do when crime scene photography was not so common?" Yan Xie asked back.

Han Xiaomei's mind was spinning desperately, but the strong aura from Vice-Captain Yan made her mind chaotic.

"It's actually quite simple." Yan Xie sneered and said slowly: "As long as the site is sealed off and kept dry, the oxidant will volatilize when it is tested again in a few days. But the iron ions will not disappear for a long time; even after a few years, it will still make the luminol shine."