Yu Fan moved towards the door step by step, since the scream outside the office just now, there was silence outside, deathly silence.

Yu Fan moved to the door and reached out to pull the door, although he was very nervous, but his hand did not shake at all, this may be the professionalism of a chemist, his hand is steady, and he is more accurate when doing experiments, after all, if he is not careful, the dose percentage may be very different. However, Yu Fan's palms were full of sweat.

Yu Fan stared at the doorknob, took a deep breath, touched the doorknob with his right hand, and pulled the handle inward gently, very gently.

Squeak~~~~Squeak~~~

Oops! Even though Yu Fan was already very light, there was still a sound when he pulled the door, and it must be the sound of the door's hinges rusting and the lubrication dropping. At this time, there was a sound of slow footsteps outside the door, the footsteps were far away, but they were very obvious in this extremely quiet environment, da, da, da, and it was impossible to hear whether the footsteps were getting closer or farther away.

Yu Fan quickly stopped, he held his right hand with his left hand, panting heavily, and his eyes didn't dare to look at the doorknob.

At this time, Yu Fan's face was covered with sweat, the sweat on his face dripped down his cheeks to the ground, and his glasses were all fogged by the sweaty heat. Yu Fan rubbed the lens slightly with his fingers and took a deep breath.

At this moment, the footsteps stopped, and there was only the sound of Yu Fan's heavy breathing in the air, and Yu Fan's heartbeat.

Yu Fan adjusted his state and continued to open the door, this time when Yu Fan opened the door, he gave the door a force to lift up, and the door did not make a sound anymore.

The door opened a gap enough, and Yu Fan squeezed out through the gap.

The scene outside the office stunned Yu Fan! This is?

This is a very large laboratory, about 200 square meters, no windows, is a closed space, there are a lot of lights on the roof, but the light is very dim, the whole large laboratory has three rows of experimental tables, the experimental table is placed with all kinds of bottles and cans, and there are large glass jars containing some specimens or something.

The fishy smell in the air is stronger, and along with the fishy smell, there is also a pungent smell.

Yu Fan carefully glanced around, there was no one, and there was a door at the end of the laboratory, and there was a sign above the door that glowed green, if nothing else, it was a safe exit.

Yu Fan moved forward slowly, observing his surroundings as he moved.

The light was too dim just now to see clearly, and when he got closer, Yu Fan was startled, the large glass jars on the experimental table were filled with liquid, and the specimens in the liquid turned out to be ......

Human Organs!!

This is not an ordinary laboratory specimen organ, the organ in it looks like it has just been put in! Because there is still bright red blood on the organs, floating in the liquid, this scene is like you just killed a fish, throw it into the water, its blood slowly oozes out and spreads with the corpse, very terrifying!!!

Yu Fan took a closer look at the organs inside, and couldn't help but gasp, it turned out to be hearts!! One in each jar, a trace of blood is emerging.

These are, bleeding hearts!

What's going on here? Yu Fan worked hard to recall, but he just couldn't remember, the more he tried to recall, the more his mind hurt.

"Psychochemist, we're meeting again." An eerie voice came from behind Yu Fan.

Yu Fan suddenly turned around and was shocked, it turned out to be Zhang Shengqian who was captured in Beiqiaogou at that time! Zhang Shengqian was dressed in black, holding a screwdriver in one hand and a fire extinguisher in the other. Zhang Shengqian's face was only half, and the other half of his face was blurred by the flesh and blood smashed by the heavy object. Zhang Shengqian stood behind Yu Fan, about ten meters away, even though he was only half of his face, he still showed a grim smile.

Such a terrifying scene made Yu Fan feel particularly familiar. Are you dreaming? But why is this dream so real?

Yu Fan said to Zhang Shengqian calmly: "Although I don't know why you always appear, what do you want to do?" ”

Zhang Shengqian pointed to his smashed face with his finger, picked up the fire extinguisher in his hand and shook it, and pointed at Yu Fan again, and his gloomy voice sounded: "I became like this, it's all because of you!" ”

Yu Fan didn't know where he got the courage to say: "So what? ”

Zhang Shengqian said fiercely: "Do you see these bleeding hearts in the jar? I'm going to slaughter you, dig out your heart, and put it in these jars, and be one of my trophies. ”

"Hahahaha." Yu Fan suddenly began to laugh.

Zhang Shengqian said angrily: "Death is coming, what are you laughing at?" “

Yu Fan: "I think you are just raising your strength and pretending to be a ghost, and your so-called 'bleeding heart' is actually fake!" ”

Zhang Shengqian smiled coldly: "Oh? What did our psychochemist find? ”

Yu Fan: "If it is a real heart or human organ, in order to prevent embalming, it is soaked in formalin liquid, that is, 35~40% formaldehyde aqueous solution, which has a strong pungent formaldehyde odor. ”

Yu Fan opened his hands, as if holding the air, and said, "But when you smell the air, it is full of a strong sour smell, do you use acid to soak your heart?" Doesn't that exacerbate corrosion? This smell does not match the taste of the herbarium. ”

Zhang Shengqian casually pulled a stool from under the experimental table and sat down, sneering and nodded: "It's a little interesting." ”

Yu Fan continued: "So I boldly deduce that the liquid in your jar is not formalin, and the heart inside is not a real heart. In my opinion, your liquid is a mixture of potassium thiocyanide solution with a little concentrated hydrochloric acid followed by a little hydrogen peroxide. And this heart is actually a model of a heart made of iron, which is not easy to find in dim light. “

Zhang Shengqian showed a very perverted demeanor, both sinister and approving: "Go on." ”

Yu Fan: "Iron and hydrochloric acid form divalent ferrous ions, which are oxidized by hydrogen peroxide into ferric ions, and ferric ions and potassium thiocyanide form a complex of ferric thiocyanide, which is the state of blood, so we can see that the 'heart' is constantly bleeding, and you use this method to imitate the real heart bleeding and create a terrifying atmosphere." However, it all comes down to your tricks, the bleeding heart. Yu Fan said that, he flicked a screw on the experimental table into the glass jar, and the screw, like those 'hearts', began to 'bleed', leaving a bright red silk screen as the screw fell. Sure enough, it's iron.

Zhang Shengqian applauded and slowly got up, saying: "Your reasoning is completely correct, and your last words are also wonderful, but soon, I will have the first heart that will really bleed!" ”

Before the words fell, Zhang Shengqian picked up the screwdriver and rushed towards Yu Fan!