"Liu Fu, are you going to buy some bitter salt?"

It has passed noon.

Zhao Xu thought about the people from the Yan County wealthy clan were probably coming soon.

So he asked Qin's account to withdraw ten taels of silver and ordered Liu Fu.

Zhao Xu nodded.

In ancient times, bitter nitroz was a medicinal material for laxatives and was sold in medicinal shops.

In modern times, bitter sulphur is called saltpeter.

This time, his method of potting silver from the wealthy families of Yan County was to use saltpeter to make ice.

In ancient times, people in the north used winter to store ice in the cellar and took it out to cool off in summer.

There are institutions specializing in managing ice warehouses in the Imperial City.

In summer, there is ice in the rewards the emperor gave to his ministers.

Therefore, ice has always been expensive in ancient times.

For Dasong, ice is more precious.

The reason is that the imperial city of Dasong is Jinling, which is the contemporary Nanjing, known as the four major furnaces.

It is different from the north. Even in winter, it is not too cold and there is no thick ice layer to pick up in winter.

In his memory, there were not many snow in Jinling City in the past two years.

So when the heat comes, Jinling City, or the entire south, will fall into ice desolation.

Rich people want to buy ice to cool off the heat, but they cannot get it.

This also led to the saying that summer ice and gold prices are the same as in the south.

It's the hottest summer now.

If you can sell a lot of ice in Jinling City, you will definitely be able to earn huge amounts of wealth.

"Buy three kilograms, go and go back quickly." He handed over the ten taels of silver to Liu Fu, and Zhao Xu instructed.

Liu Fu nodded, and in a spoon of incense, he came back with a small bag of saltpeter on his back.

The heat made his clothes completely wet.

After wiping his sweat, he gasped and said, "Your Highness, is the bitter taste coming?"

Zhao Xu nodded and asked Liu Fu to find two porcelain basins of different sizes.

Soon, the servants came to report that some people from the wealthy family came.

Zhao Xu asked Liu Fu to lead them to the front yard.

"What's the matter with your highness?" said a rich man wearing silk and pooping belly.

Looking at the dilapidated royal palace, he couldn't help but feel a little contempt in his eyes.

The dignified royal mansion is so shabby that even the yards where their slaves live are not as good as those of them.

But it was normal for him to think about it. Yan County has never been here since its founding.

This Yan King was the first, and the prince who could come here was basically no different from exile.

The emperor would not give many favorable conditions.

"Your Highness said that you will perform a skill for you when you arrive." Liu Fu copied the original words.

"Hahaha……"

Everyone burst into laughter.

"Is this Yan King's madness really good?"

"Probably not good, otherwise why is there such a ridiculous thing?"

"Oh, it's gone, it's just a mess." Someone was about to leave.

At this moment, Zhao Xu walked out of a room.

"I've seen His Highness, King Yan."

Seeing Zhao Xu, everyone began to salute.

But many of them bent over and acted like a slight look.

Zhao Xu saw it and was not angry.

One day, he would make these people kneel down and sing to him to conquer.

"No gift." Zhao Xu waved.

He had asked Liu Fu to remember all the names of these people.

He knows who comes from the servants and who comes from the head of the family.

In the future, we will know which wealthy families can win over.

"Don't be impatient, everyone, I am not fooling you. Wait a moment and you will find a chance to get rich." Zhao Xu said.

Seeing that the King of Yan had come forward in person, everyone stopped and decided to take a look again. At worst, it would be fun.

Forty or fifty people stood together and waited.

At this time, Zhao Xu entered the house.

He put the small porcelain bottle in the large porcelain bottle and filled it with water.

Wrapped in cotton again.

The principle of making ice in saltpeter is that soluble in water will absorb a lot of heat, which can theoretically drop to twice below zero, and eventually turn water into ice.

The purpose of large basins and small basins is to use saltpeter in large basins to cool down and turn the water in small basins into ice.

This way the ice in the small pot will be edible.

After all, saltpeter is still toxic.

The cotton cloth is used to isolate the heat outside.

After the ice making is finished, just dry the water in the large basin, the saltpeter will be precipitated again to remove the lost part, and the rest can be reused.

After all this is done, just wait.

"It's almost done."

After waiting for a quarter of an hour, Zhao Xu lifted the cotton cloth.

The moment the cotton cloth was lifted, a sensation of white mist rose inside, making the cold air rush.

There was already thick ice in the small basin.

He was delighted and brought the ice from the small basin to the yard.

"Please see, this is the performance I mentioned." Zhao Xu walked around in front of everyone with the ice.

"It's ice." Someone exclaimed.

"This summer is hot, where is the ice?"

“Incredible.”

“…”

A whisper rang out.

Liu Fu also opened his eyes wide, unbelievable.

Apart from buying bitter salt, Zhao Xu did not let him participate in any process.

He didn't know how Zhao Xu became.

"The King of Yan not only recovered from madness, but why did he become so powerful?" He exclaimed in his heart.

"Your Highness, is this the ice in the ice cellar?" someone asked.

This is what others think.

If not, then does this King of Yan have magic spells?

"No, this is what I did, it is the technique of turning water into ice." Zhao Xu straightened his chest.

After saying this, the rich people were immediately in a state of great trouble.

"Can your Highness know the magic spells?" A man was shocked.

"No, but just an ordinary skill. I will teach you, and you will do it." Zhao Xu's eyes swept across everyone's faces to see their reactions.

Now, many people have completely lost their contempt for him.

Some people think about it.

Some people's eyes shone in their eyes, obviously thinking about the way to make money.
To be continued...