C25

The process of making ice with earth was actually not difficult at all. As long as one understood the principles behind the technique and had sufficient materials, even a child would be able to create one.

In ancient times, people inadvertently found that saltpeter dissolved in water will absorb a large amount of heat, causing the temperature of the water to drop, even freezing. In other words, if he wanted to create ice cubes, he just needed to dissolve the saltpeter in water.

The Lingnan of this world belongs to the Song Kingdom. The Gourmet who ate everything in the southern part of Lingling was not one of the brawny man's people. However, it was very difficult to get the big man to give up on cooking with ice.

The day after Xiao Wen set up his stall to sell ice, a woman appeared next to his stall. Every day, she would set up a stall next to Xiao Wen and boil some mung beans. Afterwards, when Xiao Wen's ice arrived, she would buy some and add them into the mung bean soup to make mung beans.

After that, the fruit juices, wine, and even meat stalls with ice cubes appeared one after another. Xiao Wen's street immediately became a food street with ice cubes.

However, there was a problem if the frozen potassium nitrate solution was sold directly.

Inhaling potassium nitrate dust will irritate the respiratory tract. If it inhales high concentration of potassium nitrate dust, it may even cause pulmonary edema.

Extensive exposure to potassium nitrate will also cause methemoglobinemia, affecting the ability of oxygen carrying in the blood, such as headache, dizziness, cyanosis, nausea, vomiting and other symptoms.

And this was still light. If it gets serious, the person in contact can even cause breathing problems, collapse, or even death.

The oral administration is more harmful. If someone takes a certain dose of potassium nitrate, he will have severe abdominal pain, vomiting, bloody stools, shock, generalized convulsions, coma, or even death if he is unlucky.

Even potassium nitrate is highly irritating to the skin and eyes. Inappropriate contact may even result in burns.

However, Xiao Wen had been selling ice for a long time and there were no problems, so he had his own methods.

Firstly, before he'd started making ice, he'd spent two silver to buy a complete set of worn-out leather armor. When these things went from fur to leather armor, they had already gone through a process of nitrification. Naturally, although these leather armors were old enough to be difficult to defend against, they could withstand the corrosion of the potassium nitrate without a problem.

There was no potassium nitrate in the ice, and some of it was famous.

When making ice, Xiao Wen didn't just add potassium nitrate into the purified water. Instead, he used some tricks.

When he was making the ice, he first spent half a silver tael to buy a large amount of coarse salt. After putting the salt into the water, Xiao Wen formulated a 30% concentration salt solution.

Before he had transmigrated into this world, Xiao Wen's hometown was located in a small town in the north. But when he was very young, he lived in the southern province of Cantonese with his parents, who were out doing business.

He remembered the snowstorm that engulfed Guangdong province in 2008, trapping many of the workers who planned to go home for the winter in the north of the city on the highway. At that time, Xiao Wen was in the car and saw a salt-sprinkling cart flying by.

The salt-sprinkled cart was driving on the highway, constantly sprinkling salt water. It wasn't long before the ice melted on the road.

He had asked his parents innocently if the saltwater sprinkled down by his uncle was hot, and why the ice had melted in an instant.

Later on, he checked the information on the internet and found out that the freezing point of brine was much lower than normal water. As for the 30% salt solution, the freezing point could even be reduced to -21%!

And now, Xiao Wen had also used the low freezing point of the salt solution to create many solutions that were below zero degrees Celsius. Then, he placed a clay pot filled with clear water into the solution of the salt containing potassium nitrate to cool it down through the ice water.

This way, the potassium nitrate would not pollute the safety of drinking water, and Xiao Wen would also be able to create clean ice cubes. It had to be said that this was a method that was perfect for both sides.

"Xiao Yu, fetch water from the well. I need you to fill all the water vats here within two hours. "Do you have any confidence in completing the mission?" Entering the workshop, Xiao Wen first gave Guan Yu instructions.

Hearing this, Guan Yu proudly said, "Such a small matter, not to mention two hours, it should be more than an hour."

"He really is a proud child."

Even though Xiao Wen knew nine things about fitness, he didn't know a thing.

However, he still knew that excessive training would lead to the loss of his tissues and the pulling of his muscles.

When he was still in university, he had a classmate who practiced Taekwondo. He was originally quite good at martial arts and defeated five hoodlums outside the school. But once, for a major match, it was overtrained and resulted in a tear in the ligaments.

When Xiao Wen rushed to the scene and carried the guy onto a stretcher to the school gate to get an ambulance, just hearing that wailing sound was enough to make his hair stand on end.

One could imagine how much pain this brother must have felt.

Therefore, he didn't want Guan Yu to meet with such misfortune.

Injuries are small, but the key is to train the injuries caused by the injuries, many of which were placed in the twenty-first century and cannot be cured.

Xiao Wen didn't want Guan Yu's arm tendons to break due to fatigue. He wouldn't be able to pick up his destined Azure Dragon's crescent moon blade for the rest of his life.

Guan Yu looked at Xiao Wen in disappointment, but Xiao Wen's eyes were firm and unquestionable. He could only pout his lips and leisurely walk over to carry the water.

After that, Xiao Wen, along with Zhuge Liang and Shangguan Wan'er, moved the coarse salt that was about to be used to make the salt water.

Although Zhuge Liang and Shangguan Wan'er's position was that of a scholar, Xiao Wen didn't want the two children to become weak scholars and weak girls who couldn't even fight a chicken.

A healthy body was necessary.

Half an hour later, Xiao Wen and the other two poured out the appropriate amount of salt into almost all the water tanks, leaving only one person to fill them with water.

As for Guan Yu, he only had five or six water vats left unfilled.

However, at this time, a knocking sound came from outside the door.

Hearing this voice, Xiao Wen immediately tensed up.

He could not let the people from Heshen know that the three little fellows were helping him make ice cubes.

He immediately called out to the three little fellows, telling them to hide.

Then he went to the door and opened it.

What he saw was a man in official uniform, with a handsome appearance.

"Why do I feel that this pretty boy has a sickly, gentle, scum feeling?" Vaguely, Xiao Wen could feel that beneath the handsome appearance of this person, there was a tyrannical and bloody aura.

If Xiao Wen had experienced life and death situations, he would know that this person had just killed quite a number of people.

However, the other party was wearing an official's uniform, so he should be one of Heshen's men.

So Xiao Wen said in a strong and calm voice, "Didn't I say that I can handle the ice by myself? "I don't need anyone else."

"Hur hur." That person said, "I am Wang Er, not here to find Mister Xiao to steal my teacher."

Wang Er's words were very explicit. Without concealing anything, he said the word 'thief'.

"Then what are you doing here?" Xiao Wen asked with furrowed brows.

"I came here to tell Mister …" Wang Er told Xiao Wen about how he forced Guo Xiong to kill his brother, then cut off his wrist tendons.

"I wonder how mister is feeling?"

"Very bad." Xiao Wen said with an ashen face.

Although Guo Xiong couldn't hold his weapon anymore, Xiao Wen was clear that a beast without claws would be more cunning in using its teeth.

The current Guo Xiong would only be more dangerous than before.

"What a lousy teammate!" Looking at the sickly Wang Er, Xiao Wen couldn't help but silently curse in his heart.