Nitrate soil generally exists in toilets, pigs, cattle pens, old walls in courtyards, cliff edges, caves and ground that is not easily washed by rainwater. The nitrate soil is moist, not easy to dry, and turns slightly purple-red after being exposed to the sun. Nitrate is rich in nitrates, one of which is what Qian Scarlet Moon wants the most.

Originally, she wanted to make up her mind on the saltpeter mine, but also to get this nitrate, which is what they really need for mining and alchemy-saltpeter. Its chemical name is potassium nitrate, which is the raw material for making black powder.

But this time, Qian Scarlet Moon didn't want to make gunpowder, she wanted to use the physical properties of potassium nitrate.

"Last time, when you came back with Ah Sheng, both of you had this kind of soil on your bodies." Qian Scarlet Moon explained, and the two nodded. But the two of them are still confused about what the nitrate is.

"Yi Xiao, you pick up a load of such soil first, and remember to cover it up a little."

"Good!"

After the three of them brought back a load of nitrate, Qian Feiyue asked them to prepare a cauldron. Then he raked out the ashes of the plants and trees that had been burned in the stove. After crushing the soil and plant ashes separately, they are mixed together in a ratio of about 10 to 1.

"Yi Sheng, burn the fire."

"Okay!" Yi Sheng quickly boiled a pot of water.

Qian Scarlet Moon saw that the temperature was about the same, so she asked Yi Xiao to pour the mixture of nitrate and plant ash into the pot. Then keep the water temperature at about seventy or eighty degrees and start stirring constantly.

About a stick of incense, Yi Xiao scooped out the dissolved water according to Qian Scarlet Yue's instructions and put it in the bucket on the side. After pouring out the muck from the pot, pour the water back into the pot and heat it up. This time Yi Sheng began to heat it with a fierce fire, and Yi Xiao kept stirring with a wooden stick.

When the water evaporates little by little, the liquid in the pot still becomes more and more viscous, and some white crystals begin to appear on the bottom of the pot.

"Thousand ...... Month! Yi Xiao's eyes showed curiosity, "This is ......"

Qian Scarlet Moon looked at the crystals precipitated from the bottom of the pot, and there was a light in her eyes: "It's out!" ”

What comes out is not potassium nitrate, but salts such as sodium chloride mixed in nitrate, and potassium nitrate will not precipitate at high temperatures. In this way, after the impurities come out, the remaining potassium nitrate concentration will be higher and purer.

Yi Xiao scooped out the clear water and put it in a bucket to cool, and when the water cooled down, they saw that white crystals had come out of it again. The crystal this time is potassium nitrate, which is also what Qian Scarlet Moon wants in every possible way. As the temperature decreases, a large amount of potassium nitrate crystals precipitate.

Qian Feiyue took two bowls, one large and one small. Place the small bowl in the large bowl and fill each with water. Then some potassium nitrate crystals were taken.

"Next, it's time to witness the miracle!"

Yi Xiao and Yi Sheng couldn't help but lean forward, staring at the two bowls without blinking.

Qian Crimson threw the crystals into the bowl outside, the dissolution of potassium nitrate would absorb a lot of heat, and the water in the small bowl turned into ice cubes at a speed visible to the naked eye.

"Shhhh

"Wow-"

The brother and sister were stunned by the miraculous change in front of them.

Although Qian Scarlet Moon knew what kind of changes would happen, it was also her first experiment, and before that, she had only learned from books.

"Sister Yue, do you know how to spell?" Yi Sheng's eyes had a magical gaze in them, and Yi Xiao's eyes were also adoring.

After Qian Scarlet Moon was happy, the expression on her face gradually became solemn. She looked at the two of them sincerely: "I want to find someone, I want to let this ice be used in the transportation of seafood, and let these ice chips carry the news of finding people all over Liudu, and even beyond." ”

Yi Xiao looked at the firmness on this girl's face, and suddenly envied the person she was worried about. He knew that she would be very happy if she went to such great lengths to find him. He didn't realize that he had unconsciously ignored the scar on her face, and felt that she was so beautiful and full of charm.

They didn't know that the person they were looking for and being envied was actually only twenty miles away. If Yi Xiao still goes to mine, maybe he will run into it.

Not maybe, but definitely bumped into. Because now the people on the saltpeter mine talk about that person, almost everyone knows it, and everyone knows it. It all started when he was thrown into the sea ten days ago.

That day, Qian Mo was hung in the sea and dragged and slid for half the night, and when the head of the human tooth ordered someone to pull him up, he was already frozen and stiff. When everyone thought he had frozen to death, he opened his eyes. The coldness in his eyes made all the people's teeth shiver.

"You ......" the head of the human tooth was also shocked.

"Where is this?" Although Qian Mo was covered in injuries and almost unable to move, his voice and momentum were not weak at all.

When he learned that it was a ship full of slaves, he simply found a place on the deck and sat down to begin pranayama.

"Boss......" The thin follower looked at him talking to himself without fear at all, leaned in front of the head of the human tooth and whispered, "Boss, this person's eyes are a little terrifying. ”

The head of the human tooth poured a sip of wine: "Explain it, don't provoke him." ”

"Boss?"

"Do you want me to say it a second time?"

"No, no...... Yes, yes, I'll go down and explain it now. ”

No one bothered, and someone would deliver meals regularly, and Qianmo's recovery from his injuries was relatively smooth. By the time they landed, basic operations were no longer a problem.

"Boss Lu!" As soon as the ship docked, a strong man with a fierce face arched his hand towards the head of the human tooth.

Lu Chaotian is the name of the head of the human tooth.

"Hehe, Boss Gao." Lu Chaotian looked at the strong man playfully, "Boss Gao has made a lot of money recently!" ”

A smug smile appeared on the fierce face of the strong man: "I have to rely on Boss Lu to send me more people!" ”

Lu Chaotian waved his hand, and a group of people behind him were escorted ashore, and the women were at the front. When Huang Wanwan walked in front of the strong man, the strong man's eyes were straight.

Lu Chaotian naturally saw this scene, but he just sneered in his heart. When the women finished, the men walked one by one. When Qian Mo also passed by him expressionlessly in the crowd, the two glanced at each other. Qian Mo turned his head forward when he saw it, but Lu Chaotian looked at his back for a long time.

"Boss Lu, is there anything special about this person?" The brawny man noticed his eyes.

"Oh, I'm distracted!"

The strong man didn't say more, ordered someone to count the number of people, and handed a stack of silver tickets to Lu Chaotian: "Boss Lu, I'm afraid I have to trouble you to send another batch of people." ”

Lu Chaotian's face was furrowed when he lowered his head and counted the silver ticket, and when he raised his head, he already looked kind: "Boss Gao, the brothers want to rest for a while." ”

"Hey, old way, I'll add three percent more to you for the next batch."

Lu Chaotian frowned and pursed his lips, and finally nodded: "One month!" ”