As he spoke, Bingyu also opened the kraft paper bag and took out a few thick documents from it, which contained all kinds of supporting documents. Of course, these things were not unfamiliar to Zhang Xuan, but he was curious why this thing was in the hands of the person in charge of the small and medium-sized demon hunting office of Bingyu.

In the past, before Zhang Hang came to Panlong City to search for the middle demon, he was active as a demon hunter in a large office, and at that time, if it was the level of light theory, Zhang Hang's level at that time was far higher than the current Bingyu, rather than the current activity as Bingyu's friend and subordinate.

At that time, in order to supplement the materials of the firm, Zhang Hang also came into contact with the people who managed this aspect, and they were all people with heads and faces when they were put outside, and they discussed this material classification with Zhang Hang at that time.

The materials that the witchers usually consume are very comprehensive products, and their particularity leads to the fact that the materials used to make this product are also very special. Needless to say, the higher the grade, the higher the price of the material. But in fact, there are some articles on the classification of this material.

Because the price of the material is not determined by its own rarity, but by the highest level of management in the witcher circle himself. For example, the amount of potion crafting materials used to quickly stop bleeding and prevent decay is less than enough to make 100 flasks.

In a normal market, the price of this material is bound to rise, as this highly effective healing drug is one of the essential materials for witchers who are frequently injured in a harsh combat environment. But the price of this rare material is unlikely to skyrocket.

The reason is that the way to regulate the price of materials in the demon hunting circle is all controlled by the highest level of commanders. Objectively speaking, although the Demon Hunting Circle has a huge influence, it is actually a world that only a few people know about existing in the deep sea. The overall number of people is also scarce, so this kind of regulation is feasible.

As a result, the material classification document is reformulated every three years, and it has become the focus of all material companies and firms. The material company needs to decide which products to focus on according to the material grade specified in the material document, and which products are necessary but too expensive to produce, and need to find a way to find a substitute.

The Demon Hunting Office also needs to decide what type of demon to focus on first according to this material classification document, many things seem to be unrelated on the surface, but in fact they are all closely related. It is precisely because of this that Zhang Hang has doubts at this moment.

Material classification files are not something that the person in charge of a small demon hunting office like Bingyu can keep privately. Compared with this document itself, to be honest, Zhang Xuan is more curious now about how Bingyu obtained it.

"Zhang Hang, let's eat later, you can help me take a look at this first."

"Okay."

The two of them went to the living room and spread out the thick papers on the coffee table. Although I don't know what this is, Zhang Hang has a hunch that this time things may have a major breakthrough because of this document.

"Actually, before I met you, this material classification certificate was already in my hands, but I didn't even tell Sister Xinci about this."

Hearing Bingyu say this, Zhang Hang was a little shocked. He understands the relationship between Mu Xinci and Mu Xinci in Bingyu, and the two of them have been in love with mother and daughter since before, and it is a relationship that talks about everything. But Bingyu chose to hide from Mu Xinci about this material classification certificate? Zhang Hang felt that there might be something hidden in this, if it weren't for that, Bingyu would never do this.

It is no exaggeration to say that from Zhang Xuan's personal point of view, Bingyu will never betray Mu Xinci even if he betrays himself one day. Zhang Hang felt that Bingyu would not betray him even if he died, and the probability of Mu Xinci being betrayed was less than him.

"Bingyu, is this proof that you paid for it yourself?" Zhang Hang tried to put forward a more likely conjecture.

Bingyu shook his head and said, "Where, if you take a closer look at what is written on it, it is all genuine." ”

Zhang Hang looked at it for a while, nodded slowly, and said, "That's true...... Wait a minute, it seems that the source of these certificates is from the suburbs, right? ”

"Yes, it's a little bit off, it may be inconvenient in terms of transportation, but it is also regarded as a development zone with great development potential.

Bing Yu stared at this material classification document for a long time, and suddenly whispered: "And this classification document was actually handed over to me by an old gentleman." ”

Zhang Hang was stunned, and then said suspiciously: "An old gentleman handed it to you?" What is the relationship between you and him? ”

Hearing Bingyu say this, he was really a little shocked, you must know that the identity of the old man who can hold the material classification document in his hand is definitely not simple? So what was the reason why he gave such an important thing to Bingyu? If you do the math, you must know that it is still a little far from the time of material classification publicity.

Bingyu bit her lip, glanced at Zhang Hang cautiously, and said, "Zhang Hang...... You may find it hard to believe, but ...... He and I were actually just strangers, and we didn't even have a one-sided relationship. ”

“…… What? Zhang Xuan stared at Bingyu speechlessly, wondering if he had heard it wrong. Relationships between strangers? But he handed over the material grading certificate to Bingyu? Is this talking to him about the Arabian Nights?

"Bingyu, can you explain things to me from the beginning."

Bingyu nodded lightly and explained the matter about the old gentleman to Zhang Xuan. It turned out that before Zhang Hang came to Panlong City, Bingyu had helped an old gentleman who had a heart attack, and Bingyu was just passing by at that time, so he reached out with the idea of doing good deeds with good intentions.

After that, Bingyu also went to the hospital to visit the old gentleman a few times - the reason was because the old gentleman said that he was in the supply industry before he retired. It just so happened that although Bingyu managed a demon hunting office, he was actually a novice in the knowledge of materials, so he went to him to ask some questions, and he became familiar with it after coming and going.