"Here's the beaker, here's the test tube, here's the stirrer, here's the thermometer, the balance, the weight, the naphtha blowtorch, ......"

A batch of experimental equipment was transferred from Huang Mingshan overnight, and Zhang Hao explained it to Zhou Xueyao. At first, Zhou Xueyao was still curious, but gradually became serious, and she could see that these things were of great use.

Zhang Hao introduced it for a while before he smiled and said, "Come, let's start the experiment." Take one serving of ordinary water, low-grade spiritual spring, intermediate spiritual spring, and high-grade spiritual spring, 100 ml.

Grate the dragon's blood stone, mix well, put 10 grams of powder in each beaker, and stir gently and evenly......"

Stir, continue to add, reheat......

A whole new world slowly opened up in front of Zhou Xueyao.

As for Zhang Hao, as the experiment progressed, he also had a little surprise in his heart: it seems that this dragon's blood stone should be a 'mutated' saltpeter.

A few stone chips appeared at the bottom of the beaker, but when the solution of dragon's blood stone was dissolved, it took on a magnificent red color.

At the end of the experiment, Zhang Hao found that the high-grade Lingquan dissolved the most saltpeter, and when heated to 90 degrees, 100 ml of liquid dissolved more than 300 grams of dragon's blood powder.

Then, the liquid is filtered, and then condensed and crystallized, and the beaker gradually precipitates more translucent blood-red crystals, and the color of the solution gradually fades.

"Look, it's purified. Zhang Hao pointed to the crystals at the bottom of the beaker and said to Zhou Xueyao a little proudly.

"I'll try it......" Zhou Xueyao excitedly took the tool and got busy.

Zhang Hao sat next to him, looking at Zhou Xueyao, who was serious and busy, and time passed little by little, and before he knew it, it was already a night.

With the faint rooster crowing in the distance, Zhou Xueyao had already refined about 40 catties of pure crystals from the fifty catties brought by Zhang Hao.

In one night, Zhou Xueyao had already mastered the concept of dissolution curves, and knew about precipitation and crystallization. Compared with traditional alchemy methods, the new chemical methods are unique and show some advantages from the beginning:

Simple, transparent, and easier.

With the pure 'dragon'blood stone powder', Zhang Hao excitedly rushed out of the small courtyard, ready to find some charcoal and sulfur. I didn't want to just come out and see a guard captain next to my father looking at me with strange eyes.

"Wei Qiang, what's the matter?"

"Young master, the master asked you to go to the smelting base, and said that it was successful. ”

"Oh...... Good. Zhang Hao left after speaking.

Behind him, Wei Qiang was squeezing his eyebrows at his subordinates: "The young master spent a night here, a night ......."

"The lights were also turned on overnight. "The guards are starting to comment.

............

Zhang Hao quickly came to the smelting base, and saw his father and Cheng Tao talking and laughing, and Huang Mingshan and others next to him looked like they were listening.

"Xiao Hao, come here. Zhang Shengde was very excited, "Thank you Master Cheng quickly, I found a solution in one night." ”

Zhang Hao was a little surprised, but he still thanked him first, and then looked at his father, Cheng Tao, Huang Mingshan and others with suspicion: Who will explain?

It's still Huang Mingshan's spirit, and he immediately took Zhang Hao to check it.

Original workaround...... According to the hidden meaning of Huang Ming's words: In fact, this method was not discovered by Cheng Tao at all, but proposed by Huang Mingshan and others:

This method was also used by the Zhang family in the production of 'new arrows', that is, molten coating.

It is to dip the arrow in molten black iron water.

And now it's just a matter of taking a bath in ordinary black iron water and covering the surface with a layer of ordinary black iron. In this way, the formation can be carved on the ordinary layer of dark iron.

This is equivalent to adding a soft shell to hard steel.

As for the method similar to "porcelain burning" proposed by Zhang Hao at the beginning, it did not work. The flame is nothing, the Zhang family has oil, but after calcination again, it will destroy the properties of the steel, and high temperature heating will lead to softening and deformation, condensation and deformation.

Zhang Hao listened and asked Huang Mingshan in a low voice: "Then Cheng Tao has no contribution?"

"No, there are quite a few. The thickness of the plating, and even the thickness, weight, and format of the weapon armor, etc., were all determined or modified by Master Cheng. In addition, the master provided several simple but powerful formations. Including very practical formations such as armor piercing, defense, and reinforcement. ”

Zhang Hao nodded and looked at the freshly baked steel armor, steel sword, etc. The weapon armor modified by Cheng Tao has an indescribable charm, and it seems to have brought a killing intention.

Zhang Hao suddenly realized in his heart that the past designs of Huang Mingshan and others were at most rigid industrial designs, while Cheng Tao's designs were only afraid that they had brought a little art.

However, art is also a technique. We know that there is a word called - the art of killing!

And Cheng Tao integrated this 'art of killing' into the weapons and armor.

The armor had spikes at the elbows and ribs on the armguards - this increased the protection while keeping the weight low enough. And the formation pattern just walked through the depression of the cold ribs, and these ribs also ensured the safety of the formation by the way, increasing the life of the weapon armor.

There is a waist design on the sword body, which makes the long sword even more cold.

The long knife is more slender, increasing the thickness of the back of the knife and deepening the blood groove, which greatly reduces the weight of the blade and increases the lethality of the knife.

In particular, a soft layer of black iron is attached to the surface, which can greatly absorb the impact and increase the strength of the sword. And this layer of dark iron covered can be carved into the formation. It's a win-win.

Zhang Hao nodded very satisfied, encouraged Huang Mingshan a few words, thanked Cheng Tao again, said to his father, and took some charcoal, sulfur, and some ordinary saltpeter powder extracted before and left.

"Charcoal", Zhang Hao chose three kinds: charcoal, bamboo charcoal, and coke for petroleum smelting.

For the time being, there is only one kind of sulfur, just ordinary sulfur, and for the time being, Zhang Hao has not found the sulfur of the 'spiritual material attribute'.

When she returned to Zhou Xueyao's courtyard, Zhou Xueyao was eating breakfast, and there was an extra one prepared next to her. Seeing that Zhang Hao was back, he immediately lowered his head and blushed.

"What's going on?" was still generous before, why is it now a shameful beauty?

Looking at the smiling faces of the maids next to him, although Zhang Hao was a little puzzled, he didn't take it too seriously.

After hastily eating breakfast, Zhou Xueyao took the materials brought by Zhang Hao and began to mix different proportions of "gunpowder".

Zhang Hao vaguely remembered that the formula of ordinary black powder was: 7.5:1.5:1; But I don't know what will happen to the dragon's blood stone?

It's just that Zhang Hao opened his mouth with this ratio, which made Zhou Xueyao very suspicious.

"We've done a lot of research before. It's just that the power of ordinary black powder is really limited, so it is not taken out. ”

"Oh......" Zhou Xueyao looked at Zhang Hao with suspicion for a while before starting to equip the new gunpowder.