Ni Xiaowan took the piece of pyrite in Tang Qianlin's hand and looked at it over and over.

Ni Xiaowan asked, "Uncle Shi, so this thing is used to make iron?" ”

Yi Mochen smiled vigorously beside him, and Ni Xiaowan glared at him: "If I don't understand, I'll ask." ”

Tang Qianlin said: "This thing can't be used to smelt iron, in ancient times, pyrite has a main role is used to refine toxic sand, however, pyrite is also divided into several kinds, not all pyrite can be used to refine toxic sand." ”

Li Yunfan asked: "What is poisonous sand?" ”

Ni Xiaowan hurriedly explained: "I know this, it's arsenic." ”

Li Yunfan was taken aback, and subconsciously threw away the pyrite in his hand.

Tang Qianlin smiled: "Don't be so nervous, didn't I just say it?" It has to be refined. The method of refining is generally fumigation, putting pyrite into the steamer, and during the steaming process, the heat will cause the ore to produce white gas, which condenses on the lid of the pot to form a frost-like object, and this layer of frost is scraped off to become what we call arsenic. ”

After Tang Qianlin finished speaking, he took out a silver needle: "Also, the arsenic formed by pyrite cooking contains sulfur, and silver will turn black when it encounters sulfur, so the ancients used silver needles to test poison, but not all poisons can be tested with silver needles." ”

Yi Mochen walked away with a piece of pyrite: "This thing can also be used to refine sulfuric acid." ”

Li Yunfan nodded: "I know the sulfuric acid." ”

Ni Xiaowan looked at the mine and looked around: "No wonder it will be abandoned, this kind of mine is not very useful." ”

Tang Qianlin stepped forward and looked at the three passages in front of him: "In the past, pyrite was also an important refining substance in alchemy, and the so-called deception of turning stones into gold used this. In the West, there is a similar way of alchemy, foreigners call alchemy, and we are the same, we call pyrite fool gold, they call fool gold, are used to deceive people, in the past, people often found pyrite, use this kind of thing to deceive people to invest in mining, and then run away with money. ”

As he spoke, Tang Qianlin squatted down and picked up a smaller piece of pyrite and put it in his pocket.

Seeing this, Ni Xiaowan asked, "Uncle Shi, what are you doing with this thing?" ”

"Looks like your master hasn't taught you this before." Tang Qianlin said and took out another stone, "This is called flint, also called flint, which was used by the ancients to make fire in the past, and the arquebus used in the early years was fired from this thing." When flint collides with pyrite, it produces a large spark that ignites flammable materials more easily than flint alone. ”

Ni Xiaowan hurriedly picked up a small piece of pyrite and put it in her pocket.

Yi Mochen stood next to Tang Qianlin: "There are three ways here, this time you won't be like last time, let us divide the army into three ways, right?" ”

As soon as Yi Mochen finished speaking, Jelly Bean jumped out of his bag, sniffed on the ground, and then meowed towards the passage in front of him, and made an aggressive "whirring" sound.

Tang Qianlin lit the torch in his hand: "Look at the jelly beans means the middle road." ”

Li Yunfan looked at the jelly beans leading the way in front: "It's really rare to see a cat like a dog for the first time." ”

Yi Mochen said: "There are a lot of strange things, how many have you seen, you forgot about the Seven Star Cave last time?" ”

"Of course not." Li Yunfan said as he walked, "It was because of those things I experienced last time that I realized that there are really many things in this world that human beings can't explain now." ”

Tang Qianlin, who was walking at the forefront, said: "Don't talk about now, I estimate that in another hundred years, I can't explain it." ”

Tang Qianlin said and took out his phoenix tail compass, and after looking at it for a while, he handed it to Yi Mochen: "Boss Yi, take a look." ”

Yi Mochen looked at the compass and said, "I found out before." ”

Li Yunfan hurriedly asked, "What did you find?" ”

"White Tiger Fierce Barrier." Yi Mochen said four words simply, and took the compass and spun around in place.

Li Yunfan looked at the other three people in confusion: "What is the White Tiger Fierce Barrier?" ”

Tang Qianlin said: "Feng Shui is also called Jiaojian Sha, mainly judging from the terrain outside, we went to the Japanese fortress before that section of the road, should be in the top of our head now, where the natural formation of six deep pits, deep pits and intersect with each other, standing on a high place to see, like a long sword of confrontation, and the top of the hillside position is like a tiger's head, if the water vein continues, here is just an ordinary white tiger drinking hole, the water vein is broken, only the deep pit remains, it becomes the white tiger fierce obstacle. ”

Li Yunfan asked again: "What does that mean?" ”

Yi Mochen stood in a position: "If someone lives here, they will have the appearance of self-restraint and bury their ancestors here, if it is simple, everything will not go well, and the family will be ruined." ”

Ni Xiaowan said: "Who will bury the ancestors here?" ”

Tang Qianlin said: "Yes." I used to find this kind of acupuncture point to refine the corpse, Boss Yi, how far is it from the middle of the acupuncture point now. ”

Yi Mochen raised his hand and pointed to the front and said, "Eight zhang ahead, three feet to the left." ”

Tang Qianlin walked in front, along the mine all the way in, and after walking about twenty meters, Tang Qianlin stopped: "It should be here." ”

Yi Mochen looked at the cave wall on the left: "Three feet to the left, it's one meter, there's no way to go?" ”

Tang Qianlin walked forward with a torch for a while, and came back not long after: "The front has been sealed, I can't get by, it seems that it has been sealed for many years, and it has not been moved." ”

Ni Xiaowan said: "Uncle Shi, do you mean that the leopard slave is hiding here?" But there is no entrance, how can they get out, and how can they go back? ”

Tang Qianlin looked around and said: "Yushi said when he was hypnotized that the place where he used to live was a golden stone, which was not a gold mine, but pyrite, so it must be here, as for the entrance and exit, it will not be in this mine, but Ma Yanqing once provided a very important clue, he said that his father once followed the flag to the burial place, indicating that the Manchu Qing Dynasty banners were cultivated leopard slaves in the burial ground, and the burial place is the place of great yin and great murder, which is exactly the same as the white tiger obstacle." ”

Ni Xiaowan looked around: "But there is no entrance?" ”

Jelly Bean suddenly yelled at Tang Qianlin, scraping the ground with his paws.

Tang Qianlin squatted down and touched Jelly Bean's head and said, "It looks like there's something down there, let's do it." ”

The people picked up the rusty tools in the mine, dug where the jelly beans had been cut, and before long, they dug up a skeleton.

"Uncle Shi, bones." Ni Xiaowan looked at the tattered clothes worn by the skeleton, "It's like a worker here." ”

Tang Qianlin grabbed the pickaxe and said, "Keep digging down." ”

Later, more bones were dug up, because the bones were all crowded together, it was not easy to distinguish, and only ten skeletons could be roughly counted from the skull.

Li Yunfan squatted down and looked at the clothes worn by the skeletons, and found that each skeleton had a sign hanging around its neck, with the word "dolphin" written on the sign, and the Arabic numeral number on the back.

"It's not the miners here, it looks like the laborers who built the fort, everyone is numbered." Li Yunfan was very angry, "The Japanese scolded us for being pigs, so there is a dolphin word in front of the number, it should be that after the construction of the fortress is completed, they will all drive them here to exterminate the mouth, the devil of the dog day." ”

Tang Qianlin looked around the cave in the depths: "I don't know how many people are buried here." ”

Ni Xiaowan wondered: "It's strange, why didn't the devil just drive people in and blow up the hole directly, but buried them directly in the mine?" ”

Li Yunfan said: "On purpose, if the cave collapses directly, doesn't it mean telling people what is here?" ”

Tang Qianlin thought for a while and said, "What you said makes sense, but it's not the whole reason. ”

As he spoke, Tang Qianlin rummaged around, and finally found something like a cannonball in the wreckage next to him. Tang Qianlin pointed at the bomb with a wooden stick and said: "See, mortar shells, I heard them say before that the Japanese army used chemical bacteriological weapons on the battlefield, and this one probably didn't explode, I guess they tested their weapons by the way when they killed the laborers." ”

Everyone was furious, but now there was nothing they could do, Yi Mochen had to light a cigarette, stick it on the ground, and simply worship these compatriots who died tragically.

"One foot to the left." Tang Qianlin pointed to the cave wall and said, "Then let's dig and see what we can dig out." ”

Everyone started to dig the cave wall next to them, according to Yi Mochen's previous algorithm, they had to dig out at least one meter deep, who knew that after digging one meter, a skull fell out of the soil.

Tang Qianlin signaled not to move, and then carefully pried open the surrounding soil with a dagger, and found that there was a row of wooden shelves buried within a meter of the cave wall, and the shelves were densely packed with skulls.

Li Yunfan squatted down and looked at the skull and said, "There is a round hole on the top of this skull. ”

Yi Mochen put on his gloves and went to get the other one on the wall shelf, but the skull was buried in it and couldn't be easily taken out, so he had to pry it out with a dagger.

Who knew that after the skull was pried out, the entire wall collapsed directly, and everyone immediately dodged away.

Yi Mochen stood there, holding the skull, and looked at Tang Qianlin embarrassedly.

Ni Xiaowan said: "You are such a big person, why are you so tiger-like?" ”

"Look." Tang Qianlin pointed to the hole exposed at the collapsed location, "There is a cave on the other side. ”

As he spoke, he picked up the torch that was inserted in the ground, shone it into the hole, then put on the phoenix mask, walked about three steps inside, and at the same time inserted the torch on the ground, he also inserted the wind ruler about half a meter away from the torch, and then returned to its original position.

Li Yunfan asked, "Old Tang, what are you doing?" ”

Tang Qianlin took off the phoenix face and said, "Measure the air, measure the wind." ”

Li Yunfan asked, "What do you mean?" ”

Ni Xiaowan explained beside her: "The gas test is to test whether there is poison in it, and whether the air is enough, the torches we use for fishing are all special, if they are poisonous, the torches will emit white smoke, and if the air is not enough, the torches will also be extinguished." ”

Yi Mochen said: "Now that a hole has been opened, can there still be no air?" Isn't that? ”

Tang Qianlin shook his head and said, "If the inside is completely closed and the air is almost not circulating, once we open the gap, the gas will pour into it, and the flames on the torch will tremble." ”

At this time, the wind ruler made a low sound, and Tang Qianlin listened to it and said: "Shiyin, there is air flow in it, which means that it is a cave that communicates left and right, and we can go in." ”