: Your dream is OK

"You have never left the town, of course you don't know. Do you think they lack ice for a rich family? They will definitely make ice cellars and pick ice in winter and eat in summer." The man said. "But it seems that no one in our town can eat ice in summer. Maybe our town is too small. Even if we have money in our town, it will be completely unsatisfactory to compare it to the county or larger place."

Xue Sihu joked: "When I make a lot of money, I will dig an ice cellar, pick ice in winter and put it in again in summer."

Both of them laughed and said, "Little brother, you can have this dream."

It was not until the two of them finished the rice noodles and left, and Xue Sihu was about to finish work, Xue Yan said to Xue Sihu in a voice: "Second brother, I once read it in a miscellaneous note. There was a vague mention of saltpeter in the book, saying that they accidentally dropped saltpeter into a bowl of water, and the bowl of water became a little cold. I think saltpeter may absorb heat and make the water cool. If the amount used is used enough, is it very likely that the water will freeze-"

"Xiao Yan!" Xue Sihu immediately covered his baby brother's mouth and looked around. Seeing that no one noticed them or heard his baby brother's words, he pulled his baby brother and his baby sister to the corner behind their stall, further away from the people in the stall adjacent to him.

Seeing their fourth brother reacting so much, it was as if he was shocked. Jiang Yue and Xue Yan looked at each other and became aware.

"Xiao Yan, the one you said..." As soon as he arrived at the corner of the wall, Xue Sihu couldn't help looking around again. Seeing that the distance was so far away, he whispered in a low voice and couldn't help but ask excitedly, "Yes, it's that saltpeter. Is it really possible for the water to freeze?"

Xue Yan also whispered: "If the book says it is true, it is very likely."

"Okay. OK." Xue Sihu was ready to rub his hands. Although his voice was pitiful, he was even more excited. "Let's go buy saltpeter when you look back, but where is this thing sold? Is it expensive?"

Xue Yan: "Saltpe has a high medicinal value. It is usually sold in clinics, but it is quite expensive. The food is rare. It is so expensive, so the amount we can buy is not much. If we want to buy more, we probably have to ask Yuxuan's father to help him. Is he a doctor or a famous doctor, and he should be able to get more saltpeter. Another point is, the fourth brother."

"What?" Xue Sihu asked immediately.

"Although saltpeter can be used as medicine, it is toxic, even if it is used to treat diseases, it can only be used in very small amounts. If it can really make ice, we cannot directly put saltpeter in the water for making ice. If it is put, the ice will not be eaten."

"If this is really possible to make ice, how can I make edible ice at that time?"

"You can use a large basin to fill water, and then a small basin to fill water in a large basin. The saltpeter will be placed in the water in the basin. Not only will the water in the basin freeze, but the water in the basin also freezes. Just eat the ice in the basin."

"A good idea! OK, if saltpeter can really make ice, that's it!" Xue Sihu was very happy.

Xue Yan looked at Jiang Yue again and said, "This saltpeter should be used repeatedly. Yuxuan has a medical book about saltpeter. It says it. How to separate the saltpeter from the soil block containing nitrate? It means putting the soil block containing nitrate in a bucket, soaking it with water, then filtering, and then boiling or drying the filtered water to get saltpeter. If ice can be made, saltpeter will be in the ice at that time. Cooking or drying the ice should also get saltpeter."

In fact, the latter sentence is a bit wrong. Yesterday, his family Yuebao told him that saltpeter can be reused by using cooling and crystallization method and evaporative crystallization method.
Chapter completed!