Hearing that Zhao Xin was going to sharpen the knife, everyone else laughed, for the era of cold weapons, sharpening the knife was a basic skill, and ordinary veterans could easily master it, not to mention Sun Ji and others, in the army of the Northern Song Dynasty, they were called the existence of the king of soldiers.

In the era of cold weapons, the sword is the simplest weapon, and it is also the easiest weapon to wear, even in the 21st century, knives using special steel will have a certain amount of wear, let alone this era.

The hardness of that thing is as high as 9, which is far from the hardness that special steel can achieve, second only to diamond, the hardest substance in nature.

Maybe in other aspects, Zhao Xin is very confident and very capable, but on the knives, especially the knives that have come out, it is normal for them to grind.

Listening to the words of Sun Ji and the others, Zhao Xin couldn't help but laugh, he really thought that sharpening a knife was to take a whetstone, just sharpen it a few times, and sharpen the blade, I'm sorry, it's really not like this.

The 21st century is a century of advanced technology and consulting, and many materials have entered a terrible field, but more than that, there is some depth and breadth, even if it is sharpening a knife, it can be sharpened into flowers.

For example, the traditional bihedral blade, this is a blade that has been used since the advent of cold weapons, or even from the beginning of human use of tools, and has been used all the time.

In the 21st century, the strongest stage has been withdrawn, and the sharpest in the mainstream is generally tetrahedral, or even octahedral blades, and on the Internet, foreigners who can play even try to use electron microscopes to carry out extreme grinding, even ordinary materials, can have amazing sharpness, even if it is only used once.

Zhao Xin has also seen that video, and now, he doesn't have an electron microscope on hand, not even a microscope, but he is still willing to try to use a tetrahedral blade, which is also a handmade program to give ideas.

Using several whetstones combined, and then going through a certain method, there is a chance to sharpen a suitable blade.

Among the natural materials, there are many suitable whetstones, for example, the hardness of this divine weapon is 5.9 now, in principle, 5.9 or more, he can be sharpened, so that he has a sharp blade.

Zhao Xin began to process the whetstone, specially cut, itself is extremely hard whetstone, it is very difficult to cut, in the absence of diamond such a natural knife, can only use physical methods.

Itself, with the help of huge pressure, the current Miaojiazhuang, without this realistic condition, fortunately, there is a person like Sun Ji, who surpasses ordinary people in force, in the face of specific tools, under the hard and brittle physical characteristics of these rocks, and finally successfully completed the cutting.

It's just that this whetstone is different from the traditional one, the traditional one is a two-sided blade, and these whetstones are all kinds of them, except for one or two that are similar to ordinary whetstones, and the others are completely different.

Sun Ji and Xue Yu and the others were just watching the excitement, but when Zhao Xin sharpened the sharpening knives, if they said that they were playing casually, they didn't believe it, but they were so disciplined, and even the role of each whetstone was clearly explained, which made them hesitate.

To be honest, with Zhao Xin's prestige today, even a word of salt water can quench their thirst, I'm afraid that Sun Ji and the others' first thought was not to doubt, but to go back and think about whether this makes sense.

Zhao Xin won't think about it, Sun Ji and the others, in their hearts, how many mental journeys they have taken, it has nothing to do with him, and he will not be like the foreigner who can play on the video, the blade that pursues the limit, he just makes a different attempt, the attempt of the tetrahedral blade.

Sharpness requires extremely precise control, not only with a more precise blade, but also with sufficient smoothness on the surface, which requires precise control.

Zhao Xin has no way to make a real tool for sharpening the knife, and it is impossible to use a molecule or a microscope to see some traces on the sharpening knife, but he can combine a simple tool according to the introduction above in the video to ensure that the sharpening can be carried out smoothly.

Actually, this can be seen in the card system.

The card system, for the tools of the finished product, is a rough reality, and there is not even a formula, let alone the ingredients, but Zhao Xin slowly summed up a little bit of something in use, that is, things for different purposes, if the performance is good, their prices will be different.

The difference can be very small or huge.

The five swords were forged by different blacksmiths, but the recipes used and the process of building them were the same, and the steel swords they created were actually similar in texture, and the price was similar.

Before grinding, their prices, the difference of no more than 1 through the sharpness of the difference, will definitely cause a change in price.

With the video on the Internet, I simply polished it, and then watched it in the card system I got, and sure enough, after grinding, the price of the sword has risen, and it is quite obvious.

In the process of grinding and testing, I almost summed up some experience, and then continued according to this experience, with the initial experience in the video, coupled with the cooperation of the card system, I finally almost realized the manual sharpening of the 21st century.

Such pure strength work, Zhao Xin will not do it, some are people, Sun Ji is, his strength, can already be lifted lightly, such a simple sharpening knife, he is the most suitable, even Zhao Xin issued an order, he can react at the first time, which is also the foundation for him to sharpen.

This very delicate work not only took a long time, but also made Sun Ji himself grind, but this kind of grinding and stopping, it seems to be quite orderly, a completely different blade from the ordinary, just sharpened into shape.

Very sharp, very smooth, several different things, rubbed, sanded, and finally a glorious blade appeared.

Sun Ji didn't know, this blade and the blade, there is still a difference, in the card system shows, in the end to get 3 complete bodies, 2 are a little worse, but not much different.

But it is such a small gap, so that their price difference is more than 200 guan, of course, such a magic weapon, in the card system is also very high evaluation, up to 1000 guan, but also let Zhao Xin understand that the so-called treasure knife in this era is expensive.

But think about it, in the Water Margin, it is the story of the Northern Song Dynasty, and it was in the following decades, when his treasure knife asked for 3,000 guan, perhaps due to inflation, but this super-hard steel is the foundation, through special grinding, the final formation of the square blade, its quality, should be far above Yang Zhi's knife, the card system is just a basic price, if you really want to sell it in the future, the price should be higher than this.

After the knife was sharpened, several people were eager to try, not only wanted to see what the concept of this extremely hard, excellent quality knife was, but also wanted to see how sharp the knife that Zhao Xin had sharpened for so long was.

Sun Ji was in charge of trying, in fact, 5 are quite sharp, blow-haired and short-haired, falling paper cut, there is no problem, find out a mat piece, under the premise of not hanging, cut out of thin air, showing a huge sharpness.

This point made Sun Ji very satisfied, but Zhao Xin was not satisfied, the ancient method of testing the sword, can not be said to be wrong, the key is that what they test is simple, it is a test with insufficient hardness, which can show the sharpness of the knife, but cannot show the performance of the blade material.

Zhao Xin was also a little helpless, and in the end, he chose two, one was five pigs, which were boneless, and the other was a pig that had just been slaughtered and had not been skinned.

The first choice, after Miaojiazhuang was restored in Baozhou, began to sell buns again, the number of pork used every day is not small, take out 5 pigs, just stacked together, Sun Ji hesitated slightly, cut from the oblique direction, did not touch any of the bones, should be broken, showing a strong cutting ability, the other one, is a whole pig, from the position of the pig's head, obliquely downward, through the skull, and a relatively strong sternum, which requires huge skills, Sun Ji did a very good job,

Starting from the skull, all the way to the sternum, basically represents a person from the head to the shoulder of the knife, this, even if it is the previous magic weapon, it is difficult to do, the human body is nothing, the bones are still very hard, especially the skull, not as hard as the teeth, but it is also quite powerful, the reason why Ding Ding is so easy is that all the knife falls on the non-bone place, almost with dexterity and angle, to decompose a cow, this is the root of his strength.

But the one in front of him, after colliding with the bones, has been cutting the bones so much, Sun Ji is also a little worried, in case the blade is broken a little, this is the key for a strong knife, generally on the battlefield, ordinary soldiers can hold on for a period of time, but for a long time, especially if there are more people, knives and curly blades abound.

This is not a simple test, it is biased towards actual combat, and it is a hard-hitting test, which can not only show the sharpness of the blade, but also show the strength of the knife.

Sun Ji took a deep breath, shouted, and carried the knife with one hand, slashing at the pig's head like lightning, and when it touched the bone, it was slightly hindered, but in the face of his powerful strength and skill, it was easily cut open.

With a knife, he cut off the skull and sternum, and divided a pig that had not yet been skinned into two sections, and after cutting all the bones, it was more easy and penetrated the body like a bamboo, all in half.

Sun Ji had expected this, after separating the pigs, he was careful not to let the blood trample on his body, and then looked at the blade for the first time, and then, he smiled.

Very good, this knife easily cut through the body of a pig, but it was not damaged at all, this one can already be called an absolute magic weapon, and it is the favorite of martial artists.