"The second reagent is called the ironback reagent, which is developed from the alien creature [Shield Beast]. You should be able to guess what this reagent is for from the name. Yes, it is a reagent that gives the human body defenses and is commonly used by soldiers on the front line. The specific method of use is to inject the reagent from the intervertebral space of waist 3 and waist 4, and in about eight minutes, an oval defense shield similar to a turtle shell will be born on the back of the human body. This defensive shield we call the Iron Back. The iron back is very hard, and the average iron back can withstand the slashing and axe of an adult man, and even the impact of pistol bullets is stronger. Shang Wen explained after taking Ling Hai to another room, pointing to a tube of brown reagent. Now let's test the effect of using your iron-backed reagent. ”

Before injecting the reagent, the female assistant stepped forward to measure Ling Hai's current vital signs and draw a tube of 5 ml of blood.

"Come, you take off all your shirts first, and then sleep on the operating table, bow down like a shrimp, and the focus is to arch your back out." Shang Wen commanded Ling Haidao.

Ling Hai cooperated with Shang Wen, enduring the stinging pain coming from his back, and did not say a word during the period.

"Alright, Ling Hai, you can get up now. Then lie on your stomach and wait with your back up. If you have any special feelings in the middle, tell me as usual. ”

After injecting the iron-backed reagent, Ling Hai began to carefully experience the changes in his lower back. The imaginary feeling of fever and pain did not appear, and after 3 minutes, Ling Hai only felt an itch on his back, and then he felt something attached to his back, and Ling Hai looked sideways at the mirror on his right. I found that some brown fluid grew on my back, and the fluid slowly solidified on my back, and then, on the top of the already solidified brown fluid, a new soft brown fluid magically oozed. After that, this oozing and solidification process is repeated, as if laying bricks on a construction site, with fluid layer on top.

"It's a little itchy in the back, a little heavy." Ling Hai said suddenly.

"Normal reaction, if you have other feelings, you can talk about it." Shang Wen said calmly.

Eight minutes later, the change ended, and a defensive shield similar to a turtle shell really appeared on Ling Hai's back. This defensive shield is oval in shape, rising above the head and slightly above the popliteal fossa below. Ling Hai felt that if he put his hands and feet away, the defensive shield could wrap him entirely, and the others would never see his body from behind, only a round shield. Ling Hai curiously tapped the [Iron Back] with his backhand, and his fingers felt like they were hitting a hard stone. During this period, except for the itching on his back, Ling Hai didn't feel any discomfort anymore, so he didn't say anything to Shang Wen.

After experiencing it for a while, Ling Hai learned that the defensive performance of the iron back is indeed very good, at least it is no problem to block the attack of the sword for the soldiers, the only drawback is that it is a bit heavy. Although Ling Hai was still standing at the moment, his legs were actually straining all the time, and the whole person seemed to be carrying a bag of 50 kilograms of rice.

At this time, a question suddenly appeared in Ling Hai's mind.

Just injected a tube of reagents of tens of milliliters, why do so many things appear on the human body out of thin air, why does even the weight increase. The previous capture gloves are forgotten, although after the gloves are generated, they look heavy from the outside, but in fact, both gloves are very light, and there is not much difference between waving the capture gloves and the original arms. Ling Hai's understanding is that gloves may have been formed by absorbing some components of the human body.

But after the iron-backed reagent is used, the extra weight is about 50 kilograms, which obviously does not conform to the law of conservation of mass. How is this done?

The only possibility is that through the iron-backed reagent, the human body absorbs a lot of substances from the outside world in a short period of time to form an iron-back. Is that really the case?

"The next step is to test the hardness of the iron back." Just when Ling Hai was still immersed in doubt, Shang Wen's voice came.

Hardness test? Ling Hai immediately retracted his thoughts.

Wouldn't it be a knife to cut your back, or even a spear to your back? What if the iron back of the body can't resist it......

Ling Hai, who is usually very calm and mature, may have been affected by the novel experience of novelty and suddenly became whimsical. After all, after a turtle shell suddenly grows, no one can continue to do nothing.

Fortunately, the incident did not happen. When testing the hardness, Shangwen asked people to bring a cutting machine. Carefully cut off four pieces of hard shells the size of mobile phones from the edge of Ling Hai's back and sent them to other places for testing. Ling Hai stayed in the room to remove the iron back.

The removal of the iron back is somewhat troublesome. Shang Wen brought a basin of transparent unknown liquid, and then used a brush to evenly coat the liquid on Ling Hai's iron back. It was only a few seconds after the liquid was applied that there was a "zizi" sound from the iron back, and puffs of white smoke came out of the iron back. Shang Wen stopped and waited quietly after finishing the whole painting.

When the white smoke on the iron back did not appear, Ling Hai vaguely noticed that the iron back was slightly smaller. According to Shang Wen's explanation, the iron back atrophied under the erosion of the liquid.

Smear, atrophy. Smear, atrophy. The above steps were repeated for the rest of the year, but this time, it took more than 2 hours to completely remove the iron back.

"The last layer of shell will come off naturally within 8 hours, so you don't have to worry too much. Take a shower before going to bed tonight and your back will be back to normal. Shang Wen pressed his right finger on Ling Hai's back. After the end of the test today, drink more water, drink 2~3 liters. ”

"The most troublesome thing is done, and the last reagent is left. You wait here, I'll go get the reagents. Shang Wen breathed a sigh of relief when he saw that Ling Hai understood.

"Okay."

Not long after, Ling Hai saw Shang Wen bring a tube of milky white reagent.

"It's a fluorescent reagent. It is a reagent developed from the alien creature [Fluorescent Bug]. It does not give strength or defense to the human body, but it can make the limbs of the human body glow, and it can illuminate a radius of about 3 meters. We usually inject it in the palm of the hand, and other parts can also have a fluorescent effect, but the effect is not as good as the palm of the hand, and it is not as convenient as the palm of the hand. Someone once injected it into the face, and according to him, the face can also glow, but the eyes can't see anything other than white light. The test of fluorescent reagents is to see the duration of luminescence, the higher the concentration and utilization, the longer the duration. People with a 100% utilization rate of biological reagents can make their palms glow for about 1 hour after injecting a standard concentration of fluorescent reagents. To save time, I've got this fluorescent reagent at a fraction of the standard concentration, and we'll see how long you shine later. ”

After Shang Wen explained, it was time for the female assistant to appear.

The female assistant stepped forward to measure Ling Hai's current vital signs, as well as draw a tube of 5 ml of blood.

Ling Hai chose his left hand, thinking that if something happened and his left hand left sequelae, he could also keep his right hand to do things, because his dominant hand was the right hand.

The milky white reagent is slowly injected into the subcutaneous tissue on the back of the hand. Less than a minute after the fluorescent reagent was injected, Ling Hai saw that his entire left hand suddenly fluoresced. The fluorescence gradually brightens until it reaches the brightness of an LED table lamp. Ling Hai miraculously found that his left hand had blurred its original outline and had completely turned into a light source.

Shang Wen on the side started the timer from the moment he first saw the fluorescence.

Quietly waiting, time passed, and when the timer in Shang Wen's hand was almost thirteen minutes, the fluorescence in Ling Hai's left hand finally completely faded.

"The test is complete, Ling Hai, you wait here first, and I'll go and summarize the reports of the three reagents to Professor Li to see his next arrangements." Shang Wen said after pressing the timer off.