As we all know, underground caves don't paint out the glass on their own. Deep creatures are not necessarily capable of firing pottery, so they can only come from people, and it is unlikely that they are indigenous to the village.

Kraft discarded the small glass shards and put on gloves to clean the floor from the dust and rubble, and found a large surviving fragment.

It is about a thick round bottom of a cup and bottle, with obvious traces of artificial firing, and the craftsmanship is not as good as that of Vichem, but after wiping off the dust, you can see relatively good transparency, and the light can easily pass through a distance of more than a finger thick, casting irregular spots of light caused by uneven melting.

Unsheath the sword and using the tip to open the belly fragment of the large pottery bottle, you can see the remnants between yellow-brown and red-brown clinging to the inner wall.

Twisting a handful, he found in it the smell of old metalwork that had lost its oil film, and had not been properly treated to make it damp for so long that it was scrapped.

The attachment cracks and falls off like a slight tide of flour under light pressure, scattering into a dust-like substance, which is inevitably inhaled into the nasal cavity a little, and the smell of blood rust still has a slight sour smell that has not yet dispersed.

The uneven particulate matter appears to be a common rock, and the calcination of unclean minerals has such slag deposits.

"Rust powder?" William didn't take another bite due to Kraft's threatening gaze, but that didn't stop him from figuring out what it was, and he often rubbed against the old iron parts in the cabin.

The captain had no clue why he had ground the rust into powder, but the rust powder reminded him where he had seen these green minerals before, "I remember, I have seen these green things before, but they don't look like this, they are ground into powder and added to ink, and someone else gave me to draw parchment charts." ”

"You recognize it?"

"It tastes pretty special, a bit like rust and red iron." William smacked his lips and savored, perhaps because of the instinctive vigilance of the wound, this strange smell of blood, which was close to biting his lip, was easily remembered, "Do you have any clue?" ”

Kraft was using his barren knowledge of chemistry to analyze the pile of wreckage in front of him. It's a pity that due to the change in the exam mode that year, this otherworldly soul has not had any further study in this area, and medical chemistry has also been rubbed at a low altitude, and the level is about the same as that of middle school.

Fortunately, it's not too barren, and I can roughly guess that it's some kind of iron salt, which is suspected to turn into rust after calcination, oh no, he means iron oxide.

"I have two messages."

"One good and one bad?" William's performance showed a fairly good receptiveness, or compared to what he had experienced before, it was nothing, "I don't want to choose, just take one." ”

"We're in that alchemist's mine." Kraft picked up a green crystal from a piece of rough that had been rudely knocked off the root and stacked next to the device for access, "I figured out that our target wasn't a unique and rare mine, it had even been used in ink for a long time. ”

The appearance of green crystals, eighty percent of which are ferrous ions, considering that the product is sulfuric acid, there are sulfur-containing anions, and a few crystals made by adding water may also be added.

It is broken, as if it is a primitive dry distillation method, which collects the heating products to obtain sulfuric acid.

Congratulations to this genius amateur chemist, who went to the poor mountains and rivers and poor countryside, discovered a beautiful mineral that had actually been discovered a long time ago, and inadvertently discovered the dry distillation method under the guiding ideology of "refining the essence of ores", and finally made sulfuric acid and killed himself.

Out of secrecy, or indeed unaware that it was available elsewhere, but only in very small quantities and supplied in powder, he insisted on mining in a human-geographical environment that was almost completely isolated from the outside world.

This makes it extremely difficult for the news to be disseminated, and in the case of strict control of key personnel, it is not easy to reverse the source from the outside in, which directly leads to the end of the technology and people.

This premature invention would have been buried forever in the ground, along with its inventor and the terrible cause of its disappearance, until one day someone would be bored and throw some kind of ink raw material into a retort to play.

As a result, a clever man dug up a clue from a cerebral infarction patient, and brought people all the way to get to the last wave of mold after a few years.

There is a feeling that the treasure map that I have worked so hard to find points to the entrance of my village and the tree with my crooked neck.

"We don't have to risk developing this mine, we just have to go back and ask where this stuff is made, it's kind of incredibly simple."

William was stunned for a moment, the green light that had been worthless a few minutes ago seemed to be changing color, gilded with a layer of bright gold edges, "You just said that there are two news, what about the bad news?" ”

"That was bad news."

"Huh?"

"We're in the mines where alchemists dig for raw materials." Kraft reiterated this fact, tucked the crystals into his pocket, and walked forward with torches, "I hope you remember what happened to this mine, or would it be better to call it the 'old mine'?" ”

They stepped over shards of pottery and glass shards over the pickaxe with broken handles, chisel marks on the walls of the cave, and William soon realized what their biggest trouble was now.

"Collapsed ......"

The area where the mining traces are most concentrated, the entire section of the land has collapsed and the rocks are congested. The arrival of the cave builders was not the direct cause of the miners' killing, but it dealt a fatal blow to the weakness of the structure.

The chisel marks gathered into several small craters on the boulder that blocked the way in front of it, and a rusty iron pickaxe with a broken pickaxe was discarded aside.

"Can you go back and try another way?"

Kraft shook his head slowly, and lit the remaining torches, he had prepared a lot when he came, but he couldn't stand the consumption, "I'm afraid I won't have time to find a second way." ”

"Just a little, just a little bit?" William pushed the stone, but was shaken back a few steps by the reaction force, and the rock did not move. Walked such a long way, escaped from the mouth of such a wicked creature, was in the midst of a treasure searched, only to be blocked at the exit at the last step?

Now it may be only a few dozen paces away from the outside world, and the falling rocks have turned this section of the road into a moat, a distance that would never have been dug by manpower.

"Are those things going to add two faces?" Repeated hopes and despair alternately hit the captain, and now they are probably at the end of their rope, and Kraft's "magic" can only take them through different levels, and there is no way to find a way out of thin air.

Kraft was silent. If you want to say that he is unwilling, he is much more unwilling than William. Rather than going out to tell a story, he still has a half-human-high content that he hasn't finished writing, and he doesn't want to be in the company of arthropods and shelled insects in the depths.

But this is really not a problem he can solve, unless he can conjure up a shield machine, how to dig through the rock layer that is less than ten meters thick?

"There's not a single bone in sight, it's probably all dragged away by the stuff......" William picked out a long stone with a bit of weight, and tried to swing it. It seems that he is planning to make a last stand and die with dignity.

I have known an old book friend for ten years to recommend a book-chasing app,! It's really easy to use, driving, before going to bed rely on this reading aloud to pass the time, you can download it here.. 】

It makes sense that all I saw along the way was the alchemy device and the pickaxe, and it was not difficult to guess the whereabouts of the victims by contacting the characteristic faces of the locals that were revealed.

Shield machine? 】

Kraft touched his chin and found a somewhat dangerous inspiration in his active mind, realizing that it didn't seem to be entirely a pipe dream.