Li Chengqian looked at the sweat on Xiao Huangmen's forehead, and he muttered:

"It's really hot on this day, you put your things down, and then you can put a copper basin with water!"

"Yes!"

The little yellow door went to prepare.

Feng Xiaoyue on the side was puzzled and asked, "His Royal Highness the Prince, what is this going to do?" ”

"Make ice!"

Feng Xiaoyue was stunned, making ice?

"Can this ice still be made? Didn't it survive in the ice cellar last year? ”

Ice cubes are rare in ancient times, not everyone can have them, and it is common to build an ice cellar in the winter of the previous year, and then store ice in it, and it will not be taken out until the summer of the next year.

This method can be said to be very labor-intensive, so ice is expensive, and not everyone can afford it.

Even Li Shimin can only use a piece of ice a day to relieve the scorching temperature, and it is impossible for him to get ice cubes in the East Palace.

There are also people who sell ice, but it is extremely expensive.

In addition, there is not much money in the treasury recently, and the monthly money in the East Palace is even more pitiful, so it is even more impossible to use money to buy it.

Therefore, Li Chengqian thought of using his knowledge to make ice, at least having a better time.

It's all here, you have to enjoy it, and then you can get some ice-related drinks and other things out, it must be very refreshing.

When it comes to the stone brought by Xiao Huangmen, it is saltpeter, and he uses the principle of saltpeter to make ice.

"Just look at it!"

Li Chengqian didn't pay any more attention to Feng Xiaoyue. Because it's also unclear, it's better not to explain.

"His Royal Highness the Crown Prince is here!"

Xiao Huangmen brought a basin full of water and said.

"Put the water down, Feng Xiao asked you to go and get a piece of saltpeter for me!"

Feng Xiaoyue had no choice but to do so, and took a large white stone from his bag.

To say the least, it weighs twenty pounds.

"Your Royal Highness the Prince, this thing is very heavy! Let's let the villain come! How do you do that? ”

This weight is still a bit heavier for Li Chengqian.

Because he is only nine years old now, and he is smaller than ordinary children, his strength is naturally inferior to others.

Who made him sick when he was young, it's no wonder that Feng Xiao was worried.

"It's okay, bring it! Let this king come! ”

He had to carefully hand the stone to Li Chengqian.

"Be careful, Shen!"

Li Chengqian took the stone as if there was nothing, you must know that he used to feel heavy when he picked up ten catties of things, but now twenty catties is really nothing to him.

And it was picked up with one hand.

Cheng Yanjin's physical fitness is really a good thing, not to mention improving his physique, but also giving himself strength.

Feng Xiaoyue on the side was stunned, because Li Chengqian's behavior refreshed his cognition, is this still the prince in his mind?

Li Chengqian ignored it, but directly threw the saltpeter into the copper basin.

With a plop, saltpeter fell into the water.

Immediately after that, there was a snorting sound from the copper basin.

Then, a white mist rose from the basin, and there seemed to be a reaction in it.

Snort

This frightened Feng Xiaoyue and others, and all unexplained phenomena in ancient times would be attributed to the phenomena of gods and ghosts.

His pupils gradually dilated, and at the same time, his body trembled a little, apparently startled by this violent reaction.

There are other small yellow doors that directly kneel on the ground, calling the gods to come to the world! Bless!

The ignorant ancients could only explain this phenomenon as a god.

"His Royal Highness the Crown Prince is careful ......"

The next moment, the instinctive reaction made Feng Xiaoyue scream, and at the same time ran towards Li Chengqian, protecting him behind his body.

When he settled down, something even more amazing happened.

The water vapor disappeared, and I saw that the water in this basin instantly turned into ice cubes, and there was a hint of coolness from it.

"Too... His Royal Highness the Crown Prince... This... What's wrong? Why is the water so cool? ”

Feng Xiaoyue was a little incoherent, and everything in front of him had refreshed his cognition.

Li Chengqian didn't think so, isn't it just a simple chemical knowledge of saltpeter dissolved in water to absorb a lot of heat, reduce the temperature of the water and finally freeze, and then freeze, are they so shocked?

But think about it, now is the Tang Dynasty, or a backward feudal era, where do you understand this principle.

They are understandably shocked.

Feng Xiaoyue is still good, and the others are still kneeling on the ground and kowtowing all the time.

"Get up, what's that!? Isn't it just saltpeter and ice? As for being so shocked? ”

Li Chengqian was displeased, and those little yellow doors felt that they were rude, so they got up. There was still some panic on his face.

Then Li Chengqian said to Feng Xiaoyue: "Feng Xiaoyue, you go and try the water in this basin." ”

Feng Xiaoyue walked over tremblingly and stretched out his hand to touch it.

"This cold feeling, this is really icy ......"

"That's right! It's ice, the ice that this king made. ”

"His Royal Highness the Crown Prince, this ......"

Li Chengqian interrupted Feng Xiaoyue's words, there are some things, do more and say less.

He said: "In the future, I will transport some saltpeter to my East Palace every day, and use this method to make ice for my East Palace to use." ”

"Yes! His Royal Highness the Prince! ”

Feng Xiaoyue said bluntly, and then said: "Your Royal Highness the Prince, if you exchange these ice cubes for money, then the life of the East Palace may be better." ”

I have to say that this Feng Xiaoyue is still very business-minded.

Since ice cubes are so expensive, why not develop them? Sell for some money?

"You're right, this king is also considering this."

Then the problem is, if you want to make it bigger, a little saltpeter will not do, he needs more saltpeter mines.

So Li Chengqian said again: "It's just that the demand for saltpeter is too great, where do you get this saltpeter from?" ”

"Back to His Royal Highness the Prince, I picked it up from the cave!"

"How much?"

"Not much!"

"If it's not much, it probably won't work!"

Feng Xiaoyue said at this time: "Your Royal Highness the Crown Prince can rest assured, the villain knows that there is a saltpeter mine in the east of Chang'an City. Maybe you can mention it to the emperor and obtain the right to mine. ”

"Good, good! Good you Feng Xiaoyue, you have made a great contribution! This king will talk to his father! ”

Li Chengqian was happy in his heart, he could do some good benefits for the East Palace, why couldn't he do it? And there are many peculiar ideas in my head.

"It's a villain's honor to be able to give advice to His Royal Highness the Crown Prince!"

"Reward! Go to the treasury and get a penny as your reward! ”

Although there is not much money in the East Palace, this money can still be taken out, and Li Chengqian is a person who wants to make a lot of money in the future, what is the point of such a little money?

For such a loyal person, Li Chengqian cannot be stingy.

"His Royal Highness Prince Xie!"

Feng Xiaoyue hurriedly saluted and retreated, while Li Chengqian headed towards the Taiji Palace.