He solemnly glanced at the iron bump on the table, hesitated, and stepped forward.

He knew at a glance that these iron lumps were scrap, and since they were scrap, it shouldn't be cheating if they looked at it, right?

He picked up a piece of it, looked at it solemnly for a moment, stretched out his tongue and licked it, and then put the iron lump back in its place.

After a while, he looked at three pieces in a row, but his eyes were a little dazed.

These three pieces of iron lumps, the impurities are not ordinary, and they are no different from those refined by the blacksmith in the countryside.

It stands to reason that no matter how bad Ye Changsheng's skills are, they won't be so bad, right?

With doubts in his heart, he was surprised again, and then shook his head in disappointment.

The rest of the pieces were quickly read, and he solemnly took out his handkerchief and wiped his hands, waiting for the teacher to ask questions.

Mu Qingke smiled and said, "Solemn, do you see something?"

Zhuang nodded emphatically: "Teacher, the few iron lumps on the left have a lot of impurities, such as the impurities of different materials are formed by penetrating each other, which can be judged as waste." ”

"What about the one on the right?"

"The iron and copper blocks on the right have very few impurities, but they also have very few alloying elements, they are either too fragile or too soft, and they are also scrap from the point of view of the sword. ”

After speaking, he said solemnly, "Teacher, the student knows what Ye Changsheng is doing, he is doing the experiment of material exchange, as well as the experiment of material purification." ”

Material exchange is to allow the various components in the material to penetrate and exchange with each other, and even some wonderful reactions occur to produce new substances.

This is a very deep science, not only the swordsmith is studying, but also the alchemists and refiners, and even the craftsmen in other workshops are also studying.

The exchange of materials, involving a myriad of calculus and reasoning formulas, requires very precise measurement and control to change the composition of the material.

Zhuang Zheng still didn't dare to guarantee that he was proficient in this science, even in Fengcheng, probably only the Sword Forging Grandmaster could understand the subtle principles in it.

And material purification is easy to understand, that is, to find a way to reduce the impurities in the material.

Most of the different schools of swordsmithing have their own purification potions, which eliminate impurities in the metal.

This can explain Ye Changsheng's behavior in the past few days, if Ye Changsheng can concoct a purification potion with higher efficacy, then he can reduce the impurities in the metal materials, and then forge a higher-quality weapon.

Theoretically, it takes five days to do this, and there is every possibility of success.

It's just that solemn and puzzled is that even if the material purification fails, the texture of the waste product should not be so bad.

Behind the desk, Mu Qingke was also looking at a row of scrap iron playfully, and suddenly looked up and asked, "You probably didn't expect these scraps to be so wasted, right?"

Zhuang nodded emphatically, he really didn't expect it.

Mu Qingke laughed: "But if the old man tells you that in the past few days, all the waste products that Ye Changsheng has refined are like this, how do you feel?"

It's all scrap?!

Zhuang Zheng couldn't help but be taken aback, this, this is probably rotten to a certain level.

He didn't doubt the teacher's words, since the teacher could get these scrap irons, then he must have put his eyes on Ye Changsheng's side and monitored Ye Changsheng's every move.

Mu Qingke stood up, swept all the scrap iron into the trash can, and looked solemnly with anticipation: "Solemn, the old man let you see this, just so that you can prepare for the war with peace of mind, even if Ye Changsheng concocts a purified potion, so what, with his little attainment, it is not worthy of lifting shoes for you." ”

He bowed solemnly and said, "Teacher, please rest assured, for the glory of the swordsmith, the disciple will never allow a person like Ye Changsheng to exist!"

......

"Failed again. In front of the blazing furnace, Ye Changsheng watched the molten iron in the flames turn into the house, and couldn't help but say in disappointment.

His clothes were a little tattered, his hair was disheveled, his eyes were red, and he looked haggard.

However, in those eyes full of disappointment at this moment, there was a trace of imperceptible joy flashing.

When the flame of the furnace was extinguished, Ye Changsheng took out the crucible, looked at the black bumps solidified inside, and turned to leave.

"Throw it away. By the time he spoke, he had already walked out of the swordsmithing room.

You don't have to think about it to know that at night, those two bastards will definitely sneak the iron lump to the backyard wall and throw it at the people waiting outside the wall.

After about a stick of incense, these iron bumps will be placed on Mu Qingke's desk.

For this kind of mole, Ye Changsheng has been guarding against it for a long time, so every time he mixes materials, he will put some irrelevant things into it.

After he obtained the data and effects of the experiment, it was these irrelevant things that immediately destroyed the molten metal, so he would refine pieces of scrap iron lumps.

But in reality, he was very close to success.

Back in the room, Ye Changsheng took a shower, sat cross-legged on the futon, and with a movement of his mind, the whole person entered the space of the Luo Realm.

After resting for a while, and when his energy recovered, he took out Zixumu and a booklet, and began to continue the calculations, correcting the values on the formula.

Coming out of the Jara Realm, he got up and went to the ingredient workshop, adjusted the ratio of the ingredients according to the corrected values, and finally synthesized them into a purification formula.

After all this, it was late at night.

Ye Changsheng cleaned up the long table in the workshop, leaving no traces, and then returned to the room with a yawn.

After locking the doors and windows, he took out the swordsmith's three-piece set and skillfully arranged the magic circle.

Then he sat cross-legged in the center, pulling out a large pile of materials from the demon space and placing them aside.

After a moment of pranayama, Ye Changsheng drew his fingers, and a piece of iron the size of a fingernail flew up, straight forward, and landed steadily on the Xuantie frame.

Ye Chang let out a breath and sent out a thought towards the small flame in the Spirit Sea space.

Just yesterday, the two spiritual senses in the Spiritual Fire of the Mother and Child, namely the Flame Rabbit Goo and the Dark Holy Flame, finally reached a compromise and were safe with each other.

This was tantamount to disarming the time bomb in the immortal's body, at least for a short time, he no longer had to fear that he would be burned to death by the spiritual fire.

The spiritual fire of the child and mother that fused with the dark holy fire has increased its power a lot, and the tacit understanding with Ye Changsheng has also improved a lot.

However, this tacit understanding was not enough for him to harness the spiritual fire to forge a sword, but operations such as smelting small pieces of metal could still be done.

As his thoughts were conveyed to the Zimu Spiritual Fire, the Zimu Spiritual Fire pulsed slightly, extending a dark red line of fire.

This line of fire stretched out from his fingertips, deep and heavy, like a dark red line of blood, and finally extended to the front of the black iron frame.

Call!

The iron on the shelves was shrouded in dark red flames.

Under the high temperature, the metal iron was burned red, and the impurities turned into blue-black smoke, which drifted upwards and was then purified by the rotating Xuankong Cross.

Just as the iron began to melt, Changsheng's right little finger drew circles, and the flames of his middle finger suddenly turned into rings of fire, which were placed on top of the iron.

His other hand grasped forward, and the powerful energy extended forward, like an invisible container, catching the molten iron.

The first step was successfully completed, and a smile appeared on Changsheng's tense face.