Heavenly Sin stepped forward, directly reached out and picked up a large piece of it, first doubled, and found that this piece of metal was at least more than five catties, dark and shiny, like the crystalline luster of coal, and the blue color reflected with the sunlight, which was indescribably beautiful. But the more beautiful things this is, the more difficult it is to get them, at least that's what the memory in Tiansin's mind tells him.

Although the other piece is small, it is actually more than three catties, pure and flawless, like platinum, but it is denser and harder. But this kind of 'pure' thing is definitely very difficult to deal with, because only those things in nature that are 'very exclusive', not as good as gold and the like, can remain pure and not be disturbed by any other miscellaneous matter.

He smiled bitterly lightly, and then Heavenly Sin raised his head and asked, "These two pieces of metal ...... Yes, no matter what their name or function they are, in the eyes of this candidate, they only have a glimmer of possibility, the possibility of becoming a famous weapon, from a rock buried in the deep mountains to the pinnacle of shining all things! It's just that I want to ask, you have two choices now, do you want a beautiful sword or a powerful sword? ”

Onihei was stunned for a moment, and said suspiciously: "Absolutely beautiful and powerful...... Can't they coexist? ”

Heavenly Sin laughed dumbly and said, "Coexistence? Joke, everything in this world has advantages and disadvantages, and the bright moon in the sky is still cloudy and sunny, not to mention the state of this forged magic sword? Posture, color, sword appearance, are in conflict with performance, originally if you want to pay attention to the way of chopping, it will be made into a knife, if you want to pay attention to the way of piercing, then it will be made into a gun, the sword, originally is the pursuit of beauty, when Chiyou invented all the weapons in the world, its shape is hundreds, but did not make a sword, because the sword was not originally used to kill! It is a symbol of people, a symbol of men! But even so, there are two kinds of swords, one strong and one beautiful, what do you want? ”

Guiping was stunned again, and couldn't help muttering, "Who is Chiyou?" Then he asked, "Is there no middle ground?" ”

Heavenly Sin smiled: "Compromise? There can be a compromise between performance and aesthetics, but ...... Did it work? The golden mean is a good quality in people, but if it is placed in the way of the sword, it is useless! Beauty can't be eye-catching, profit can't be cut off, what's the use? Even if the grade is higher...... Hmph, I don't bother to do it! ”

The corners of Ghost Ping's eyes twitched, and he thought that this was indeed the truth, so he said, "Then ...... Then ......"

He originally thought that he could choose it quickly, but when it came time to say it, he was entangled. Who doesn't want to be beautiful? Sword of Beauty...... It's beautiful! Surely blind those fellow disciples! But the performance is not good, it is definitely a showmanship, if the performance is ...... It's tantamount to a brocade night walk, although it has a powerful thing, but it's very unpleasant, isn't it?

In fact, this is really a kind of embarrassment of the forging technique, the sin did not deceive him, beauty and performance can never coexist, and the other so-called coexistence is nothing more than using extremely high means to achieve the ultimate in beauty as much as possible under the premise of maintaining a certain performance.

There are two secrets of the world that were once hidden in the mind of the heavenly sin!

One is jade steel, and the other is the way of casting and forging.

What is casting? Quite simply, for steel, iron is turned into molten iron at a furnace temperature of more than 2,000 degrees Celsius, and the carbon and other impurities in it are burned off, so that the molten iron is smelted, and then poured into a container of a certain shape, and cast into a vessel. Short-term cauterization of raw iron, extremely hard but fragile, long-term cauterization into steel, although the hardness is poor but full of toughness, light and thin can even be arbitrarily bent. After increasing the temperature to prolong the combustion time and adding certain special powders to remove carbon and impurities as much as possible, steel is obtained, which is mainly used for tools and blades.

Therefore, from a certain point of view, casting is the king, it is a sustainable and more promising skill, and when the steel technology in Tiansin's mind is developed to a very advanced level, the steel smelted by any steel mill can be called 'divine iron' if it is put in ancient times.

In a word, casting is the road of science and technology.

What is Forging? Forging was first out of 'helplessness', especially in barren areas, and it was even remembered that the island nation carried it forward. To put it simply, coal can make the furnace temperature reach more than 2,000 degrees, but not everywhere has this kind of high-heat fuel, if there is none, you will choose wood, and wood burning can only reach more than 800 degrees, after unremitting efforts people have mastered the method of 'charcoal burning', the furnace temperature with charcoal can reach 1,500 degrees.

But the embarrassing thing happened, 1,500 degrees, which can only make the metal red and soften, but it cannot melt it into molten iron, let alone remove the carbon and impurities in it. However, human intelligence could not be imagined, so the process of 'forging' was invented, using tedious processes and constant percussions to achieve results that can only be achieved by burning.

In a word, forging is the road of craftsmanship.

But these two processes are not without intersection, and there are so many people, very few, who can combine the two to create something that is beyond the reach of people! In my memory, the top ten ancient swords of the Celestial Dynasty are all the pinnacles of the combination of these two crafts.

Whereas...... The so-called thing pole must be a great success, forging can indeed often create a miracle, the craftsman has the help of heaven, and the creation of a thing beyond a qiē.

One of them is Yugang!

What is Yugang? The ultimate in iron beauty! The blade made from it can be polished and you can see the crystal sparkle on it as if it were beautiful jade. The famous weapons of the island country are all forged with jade steel!

But in fact, Yugang is just a "waste" produced by the immaturity of the process and the "failure" under certain factors, which is extremely beautiful but extremely weak.

Because the furnace temperature is not enough, pig iron steelmaking fails, becoming a black lump, in which the carbon content is unevenly distributed, impurities are rampant, and even making a pot is easy to leak holes, but it is such a failed product, in which there are zài 'foreign bodies', almost every piece of failed steelmaking works will appear more or less a piece of iron with a crystal crystal surface, it is a kind of 'deformed steel' formed by a singular arrangement of carbon elements because of a certain temperature and a certain combustion time when the carbon content is around one percent.

It's a kind of 'mistake' in nature, a beautiful mess of mistakes.

This has to be said to be the miracle of carbon, the softest and hardest thing in the world is pure, it is formed by different arrangements - graphite and diamond, Mohs hardness from one to ten degrees occupies two extremes.

And it is such a product of 'failure', and if it is taken down separately and forged by a certain process, it has become countless famous knives of amazing beauty in the world, but at the same time, it ...... It is also almost the most fragile iron tool in the world, and you can easily cut them all with a household kitchen knife, and its practicality is ...... Chop the flesh and bones with all your might, one knife will collapse, and two knives will break.

There is also a secret thing in this, which is the 'meteoric iron' that has been rumored to be a god. What is Meteoric Iron? The usable part of it is precisely one hundredth of the carbon element that melts at a certain temperature due to high-temperature friction...... Yugang!

In fact, there is such an indisputable fact that makes people a little desperate, and the masterpieces that can be passed down through the ages are actually these kinds of things that cannot be used for a lifetime or can only be used with extreme care, like flowers in a greenhouse.

There is always such a chasm between beauty and practicality, as if it were an insurmountable rule of heaven and earth.

Ghost Ping finally took a deep breath, and then sighed: "I held a sword at the age of two, learned a sword at the age of three, and entered the house at the age of seventeen. If you want to use weapons, flying flowers and picking leaves can hurt people, ordinary weapons can also be used to the extreme, if it is said to be beneficial to cultivation, as long as a first-grade blade can play all my cultivation, but these have a place to find after all. I think ...... When I practice swordsmanship to my level, I don't need to intersect with the enemy's blades. ”

This makes it very clear, he wants to look good.

Heavenly Sin smiled, nodded and said, "I knew that you would choose this way, so ...... I'm going to ask you another question, do you want the Sword of the Wind or the Sword of the Sky? ”

Ghost Ping was stunned again, a choice just now made him almost vomit blood, what? And also?!

I couldn't help but ask, "What is this statement?" ”

He's annoyed and doesn't pretend to 'understand' now, Lao Tzu just doesn't understand, you tell Lao Tzu to understand first!

Heavenly Sin laughed and said: "The so-called sword of the breeze is the sword body to win with softness, the so-called 'earth-shattering steel, only do finger softness', steel from a hundred refining and 'immortal', put in the palm of the finger around a circle and constantly, let go is a flat bullet." It is suitable for people with a wide heart and swordsmanship. The so-called sword of the sky is the sword body to win with strength, the so-called 'earth skin thousand layers of iron, the sky collapses and I keep it'! It is the trend of rather bending than bending, and you must have the temperament of tens of millions of people to master, and you can only choose one of these two! ”

Oni Ping's body trembled slightly, his natural Dao sword needs to have a certain toughness, his own sword is like this, the tip of the sword will bend after exerting force, but as long as the force disappears, it can be bent back immediately. Can...... He really didn't know that a sword could be flexible enough to make a circle on his fingers, or that a sword could be as strong as pig iron, and could only be broken and not bent. Both of these options are too extreme, either too soft or outrageously strong, how to choose?

It was still the words 'I will keep myself when the sky falls' that touched Guiping's heart, and he hurriedly said: "Then ...... Then you need the Sword of Optimus! ”

Tiansin laughed again: "Ben Hou knows that you have made such a choice, well, now that the raw materials are available, these are enough, you also choose, Ben Hou also has a plan in his mind, but...... There's no place to forge a sword here, don't you think you can forge it empty-handed, right? ”