Ice, in ancient times, was an absolute rarity in all seasons except winter, and even in the 21st century, there were people who sold it.

According to historical records, in ancient Chinese imperial palaces or some nobles, there was a saying that ice cellars store ice for a long time, and the general practice is to freeze the water into ice in winter, and then store it in a pre-dug cellar, and then seal it, and take it out and use it in summer and autumn.

However, there is a disadvantage of this method of ice storage, that is, once the ice storage is opened, it must be consumed in a short time, otherwise, it will melt quickly, and it is also very expensive because ice was difficult to preserve in ancient times.

Now in Datang, the time has come to autumn, although the weather is not as hot as summer, but if you can have some ice cubes to relieve the heat, it is also a very good choice.

Li Chunfeng, in his previous life, was a speculative businessman, so he has a very keen sense of smell for "doing business", when he discovered that saltpeter can cure ice, his hidden essence in the depths of his heart is undoubtedly exposed, and the matter of "making money" has almost penetrated into his bone marrow.

"Make money! Make hay! ”

Li Chunfeng's eyes were full of "small money", and at this moment he suddenly felt that it was actually not bad to be an ancient person, at least it would allow him to call the wind and rain in the shopping mall, so the next day, as soon as it was dawning, Li Chunfeng got up quietly.

"Squeak! ——”

The door opened, Li Chunfeng walked out of the house, stretched his waist, and walked out.

Under normal circumstances, at this hour, Li Chunfeng should still be asleep in bed, but today, he got up very early.

At this moment, except for Li Chunfeng, there was no second person in the mansion who got up, opened the door lightly, and Li Chunfeng disappeared into a gray cloud with a flash.

Li Chunfeng is still very unfamiliar with Chang'an City, and he doesn't know where to buy saltpeter Li Chunfeng, but he didn't ask Sun Simiao, because he felt that he couldn't let others get a piece of the pie with such an opportunity to "make money".

"Hey, it would be nice if this Datang could also apply for a patent." Li Chunfeng pouted, no matter how careful he was, this ice-making method would leak sooner or later, and there was no such thing as a "patent" in ancient times.

Before the leak, Li Chunfeng wanted to make a lot of money, so he didn't tell anyone, including Yuan Tiangang and Sun Simiao.

Out of the fang, the sky was a little brighter, and the time was about six o'clock in the morning, and there were already few pedestrians on the streets of Chang'an City.

"Uh...... This old man, may I ask, do you know where to buy saltpeter? Li Chunfeng stopped a passer-by and asked.

"Nitty what?"

"Saltpeter!"

"What is saltpeter?" The old man looked confused, obviously not knowing what saltpeter was.

Li Chunfeng could only pout: "Oh, it's nothing, I'm sorry." ”

Saying goodbye to the old man, Li Chunfeng walked to another person in the distance again: "This Langjun, may I ask, do you know where to buy saltpeter?" ”

"What stone?"

"Sorry to interrupt."

asked several people on the street, but none of them knew what "saltpeter" was, which made Li Chunfeng a little worried.

At this moment, the sky has been bright, and the pedestrians on the road are gradually increasing, Li Chunfeng stood on the side of the street, looked at the crowd of people coming and going, and muttered: "Doesn't anyone know what saltpeter is?" ”

Saltpeter is a thing, because it is not a daily necessities of ordinary people, so few ordinary people know about it, but if Li Chunfeng asks the Taoist priest, I am afraid that the result will be different, after all, this saltpeter is the raw material for their alchemy.

"Taoist priest...... Taoist priest ......"

Li Chunfeng's eyes kept searching among the pedestrians, and a long time passed, but he did not find the figure of the Taoist priest.

From more than 5 o'clock in the morning to 9 o'clock in the morning, Li Chunfeng was not dripping, and his stomach was "gurgling" at the moment.

"Forget it, let's find a place to eat first."

Anyway, he didn't have a clue for the time being, so Li Chunfeng simply found a place to sit down and have breakfast.

Stopping and stopping at many breakfast stalls, Li Chunfeng finally found a breakfast stall that looked normal.

The things sold at the stalls are modern mush similar to "pimple soup".

"Bring me a bowl of this, too." Sitting in the seat, Li Chunfeng shouted at the boss, because he didn't know what this thing was called in Datang, so Li Chunfeng could only skip it.

But fortunately, the Chinese language is broad and profound, and even if you don't speak a few words, you can understand it.

"Okay, Lang Jun wait a minute, I'll be here soon."

Sitting on the low seat, bored, Li Chunfeng looked around.

There are not a few people in this breakfast stall, most of them are vegetable farmers who pick vegetables and sell them, they set off from home at three or four o'clock in the morning, pick up vegetables and come to Chang'an City to sell, so that they can eat something at this breakfast stall.

At this moment, there are four vegetable farmers sitting next to Li Chunfeng, drinking pimple soup and chatting with the four of them.

One person said, "Hey, you say, that stupid Taoist priest is still coming today?" ”

Another person said: "Haha, who knows, will you eat the bad vegetables you sold him yesterday, and you can't get out of bed today?" ”

Another person said: "Oh, you two are so bad, the food is bad, and you still sell it to people?" ”

"Don't frame me, the food is just a little unfresh, and it's not bad."

"Look, look, that stupid Taoist priest is here again."

One person reminded in a whisper, and the four vegetable farmers turned their heads to look into the distance, and when they heard that it was a "Taoist priest", Li Chunfeng couldn't help but be interested, and looked at the eyes of the four.

I saw that a hundred meters away, a person dressed as a Taoist priest was walking slowly towards this side.

"Look at it, look at it, this stupid Taoist priest is fine."

"I'll just say my food is fine."

"Well, you see, he's buying good things with money in his hand."

"Where did this stupid Taoist priest get so much money?"

"It doesn't matter where the money comes from, hey, believe it or not, I can ask him to give me the money obediently?" One of the vegetable farmers was obviously a little scheming.

"You're trying to deceive people again?"

"What is a lie, do you want me to be good, you can see it later."

The words of these four vegetable farmers all fell into the ears of Li Chunfeng on the side, trying to deceive a fool? Li Chunfeng smiled slightly at the corner of his mouth, obviously not wanting their "trick" to succeed.

The person who was called "Silly Taoist" by the four people bought some food at the roadside stall, and then walked straight to the stall where Li Chunfeng was.

"A few Lang Jun, so fateful, we met again."