"When you return to the tree house, I have something to give you that will save you from having to walk to the mines every time." However, Xu Xin did not want to ask how she found the saltpeter mine. He planned to give Li Wenxi a bottle of mutation potion and a mutant beast contract so that she could be more efficient.
"Ah? A means of transportation? Give it to me? Wow, you are so nice!" Li Wenxi's voice was full of surprise. This was her biggest trouble at the moment, and she didn't expect Xu Xin could actually solve it for her.
"It's okay, it's okay. I'll explain it to you after I give you the thing. Oh, by the way, do you have mutant beast meat?" Xu Xin asked.
"There are quite a lot, all green-grade meat. I have never dared to eat it for fear of problems. Do you want it? I can give it to you." It seemed that she was very pleased that Xu Xin helped her solve the problem of transportation, so she gave the meat to Xu Xin without asking any reason.
"Keep it for yourself. Eating this meat for a long time can improve your health and it is very delicious."
"Did you eat it? The introduction seemed to say that it was just a kind of edible meat. How could it actually have such an effect?"
"Yeah, after eating it, I felt a little stronger, although it was very weak."
"Oh, I see. You want to use saltpeter to preserve mutant beast meat, right? Now that everyone has just come out of the dungeon, we have a lot of mutant beast meat, and they don't have any way to preserve it. We can just plunder it!" Li Wenxi was eager to try, "I'm almost there. I'll give you saltpeter when I get back!"
After hanging up the phone, Xu Xin took out a mutant beast contract and went to the synthesis table downstairs to make a bottle of mutation potion. He planned to give these two to Li Wenxi in exchange for her saltpeter.
With their current strength, they can force a wild boar or bison to drink the mutation potion, and after it mutates, they can use the Mutant Beast Contract to bind it.
The Mutant Beast Contract was not a special mount contract, so it certainly wouldn't be like Xu Xin riding the Silver King, where he would be as steady as a rock and not be thrown off even at the fastest speed, but ordinary riding could still be achieved.
And even if you don't ride it, it's also suitable to hang a few backpacks to carry goods. This method is very suitable for Li Wenxi. Otherwise, she has to travel long distances every time and carry the goods by herself, which is time-consuming and laborious. You know, time is very precious now. The labor cost is so high that Xu Xin was a little embarrassed to bargain with her and ask her for it.
With saltpeter that can be used for cooling, Xu Xin plans to build several large refrigerators to store some mutant beast meat as reserve food.
Just like Li Wenxi said, he could go directly to the platform to buy some mutant beast meat. After all, there were more than 1,800 people returning from the dungeon. There was quite a lot of mutant meat on the market now, and the price was very low, because everyone felt that they could not finish eating all the meat within three days.
Soon, Li Wenxi called Xu Xin via video.
After the video call was connected, Li Wenxi on the other end of the video seemed a little excited: "What do you want to give me? I have the saltpeter ready."
Xu Xin sent the properties of the mutation potion and the mutant beast contract to Li Wenxi.
"This... You can actually create mutant beasts!" Li Wenxi was very surprised, especially when she saw the mutant beast contract. She immediately understood Xu Xin's idea and clapped her hands, "You want me to use the mutation potion to create a mutant beast myself and contract it?"
"That's right." Xu Xin nodded. "It's best to choose something like a cow or a pig that can carry weight. It will be of the greatest help to you."
"Hmm... If I have to choose one, it would be the cow. Riding a pig is too weird!" Li Wenxi imagined himself riding a pig and shook his head as if to get rid of the image in his mind.
Xu Xin told her some precautions regarding contracts and potions, such as making sure the mutant beast had the intention to surrender before using the contract.
"I understand. Let's make a deal!" Li Wenxi directly initiated a deal with Xu Xin.
The other party initiates a transaction with you, Mutant Beast Contract (Green)*1, Mutant Potion (Blue)*1 in exchange for Saltpeter (Blue)*2
Blue grade saltpeter? !
Li Wenxi on the screen spoke up, holding a crystal-like saltpeter in her hand and playing with it: "I just came back and did some appraisal. Among all the saltpeter, there are four blue-grade saltpeter. I'll give you two. The introduction seems to say that the functions of blue-grade saltpeter are much stronger than those of green-grade saltpeter."
Xu Xin immediately clicked to agree, and two palm-sized pieces of blue-grade saltpeter appeared in his hands.
Saltpeter (Blue): A high-grade saltpeter that absorbs a huge amount of heat when dissolved in water, making it extremely effective! Just one piece is enough to make blue-grade explosives.
When Xu Xin saw the word dynamite in the introduction, his heart skipped a beat. It was actually possible to make dynamite, but unfortunately, he didn't know how to make it.
However, the previous sentence about absorbing a “huge” amount of heat made his heart beat faster. Could it be that the cooling effect was extremely strong
"Have you tried the function of blue-grade saltpeter?"
"Well, I just threw a piece of ice into the basin, and it froze instantly, and the surrounding temperature dropped several degrees!" Li Wenxi pointed to a basin of ice next to him and said, "My legs are still a little cold now."
So strong!
You know, to make ice with normal saltpeter, not only is the amount consumed very large, which is basically close to one to one, but the ice-making time is also not fast, and it takes half an hour to freeze. But this blue-grade saltpeter block actually froze in an instant, and even caused the surrounding temperature to drop!
"Okay, I can't wait to sign the mutant beast contract. It must be completed before tomorrow's event. I'm going to go out first. You study saltpeter. I'll copy your homework when I come back, hehe."
"Okay, by the way, ice made directly from saltpeter is not edible. Don't use that basin of ice to make smoothies. If you want to eat it, make ice through a bucket."
"I know this, okay? I'm not that stupid!"
After hanging up the video, Xu Xin couldn't wait to try it out. He filled a basin with water and put the blue saltpeter in the water. Suddenly, the water froze at a speed visible to the naked eye. At the same time, a chill came out, and the temperature around him dropped instantly, causing Xu Xin to shiver.
The saltpeter was frozen in the ice without any change in shape.
"This... This is too strong!" Xu Xin was a little shocked.
He immediately changed his idea of making a refrigerator.
What kind of refrigerator is this? He can use these two pieces of saltpeter to make an ice cellar! With an ice cellar, he can store a large amount of mutant beast meat and other food, which is equivalent to a small granary!
He quickly began to plan the ice cellar in his mind.
To build an ice cellar, you need to first lower the temperature inside the ice cellar and then place the ice cubes inside.
The ice cellars of the ancients were actually quite simple. In the winter, they would chisel large chunks of ice and put them in the cellar. Because the cellar was underground, it had a strong ability to maintain temperature. So in the summer, the ice would basically not melt, so the cellar could always maintain a low temperature. This was an ice cellar.
Now it was summer, but there was no natural ice for him to use, so he needed saltpeter to cool down and make ice. This was difficult to do with ordinary saltpeter, after all, it would take too much to cool down the surroundings and make a lot of ice. But his two blue-level saltpeter could fully meet his needs.
What he needs to consider now is where to build an ice cellar. Generally speaking, ice cellars are built underground. There is no ventilation and light, so little heat can be conducted into the underground, which is why ice can be preserved for a long time.
But if it was set up underground, he would have to go down from the tree house every time he went to the ice cellar to get something. It would be very troublesome if something happened that prevented him from leaving the tree house, or if the cellar was flooded by a flood.
So Xu Xin planned to build an ice cellar on the first floor of the tree house.
It's not just because it's convenient, but he actually discovered early on that the floor of the tree house has heat-insulating properties.
His furnace was placed in the corner of the second floor of the tree house. Every time he used the furnace, the high-temperature flame inside the furnace would emit very strong heat. You know, the flame for smelting iron blocks is over one thousand five hundred degrees. Whenever the furnace was running, unless he went to get materials, he would try to stay away from the furnace.
When he used the furnace on the second floor to smelt ore and sand for a long time, the temperature near the furnace was ridiculously high. Especially now that the ambient temperature was not low, the entire second floor was like a high-temperature sauna.
According to common sense, the third floor should also be like a steamer. But no, the floor of the third floor is still cool, and only the area near the stairs is slightly affected.
Therefore, it is entirely feasible to use the first floor of a tree house as an ice cellar, provided that the tree house floor and walls are insulated.
Xu Xin immediately began to renovate the first floor of the tree house.
The ice cellar does not need to be as big as the entire first floor. There is no need for that. Xu Xin divided the first floor into two parts. He separated the inner half and used it as an ice cellar.
He covered the windows with wooden shutters to prevent sunlight from entering, and the entire room became a dark, enclosed and insulated environment.
Xu Xin filled a huge wooden barrel with water, placed it in the room that was to become an ice cellar, and threw a piece of saltpeter (blue) directly into it.
The moment the saltpeter sank into the water, the water surface made a crackling sound and froze directly. The saltpeter was frozen close to the water surface. At the same time, the water in the wooden barrel was gradually frozen, and a bone-chilling coldness emanated from the barrel.
"Crack!" The expanded ice in the wooden barrel burst directly after being frozen, and wood chips fell all over the ground. At the same time, Xu Xin felt the temperature in the entire room drop sharply within half a minute, falling directly from 30 degrees to a few degrees, which has reached the temperature of the refrigerator's refrigerator compartment.
"This blue-grade saltpeter has such a strong ability to absorb heat, and it has not been consumed at all!" Xu Xin looked at the saltpeter frozen on the ice and took out a pickaxe to chisel it out. This piece of blue-grade saltpeter still maintained its original appearance, and it was probably just dissolved with a layer of skin that was invisible to the naked eye.
But even if it is all dissolved, it doesn't matter, it can be precipitated and reused. This blue saltpeter is really convenient!
Continue to repeat this action. After the third bucket of water is frozen, the temperature in the entire ice cellar is already very cold, at least below minus ten degrees Celsius. Combined with the three pieces of ice made from saltpeter (blue) with a lower temperature to maintain the temperature, the entire ice cellar is basically completed.
Xu Xin couldn't stand the cold anymore, so he hurried out. As soon as he opened the door, he was overwhelmed by the heat. The contrast of dozens of degrees made him feel extremely uncomfortable. Fortunately, his body had been strengthened, otherwise he might have gotten a minor illness.
He quickly closed the door to prevent the cold air from coming out.
Next, he wanted to enrich the contents of the ice cellar! He wanted to build a small granary in the tree house!