Li Zheng found that the old eunuch had been staring at him, for fear that he would cut corners.

The first step in removing impurities is complete.

In front of the simple fine salt refining workshop, dozens of buckets are displayed.

In the bucket was a pounded salt mine.

The old eunuch Wang Wen watched Li Zheng soak the salt over and over again.

Seeing that the salt mine is becoming less and less because of the dissolution of water.

He said to Li Zheng anxiously: "County Marquis, the salt is soaked in this way." ”

"It's called removing impurities, and you think that just mashing the salt is fine salt?"

"But it's not enough for the county marquis to be in trouble if it goes on like this......"

Seeing Li Zheng's displeasure, Wang Wen hurriedly said: "It's the old slave who is talking too much, and the county marquis, you continue." ”

Li Zheng then continued to soak these salt mines.

The old eunuch Wang Wen recorded Li Zheng's every move, and if he couldn't refine the fine salt, this would be Li Zheng's crime.

Pour all the water that had been soaked in the salt mines.

The water has been changed five times, and the water is poured into the bucket again, and then soaked in the salt mine.

Nowadays, the best salt used in Datang is sea salt.

Because sea salt has the least amount of impurities.

Many well salt mines and lake salt have a lot of impurities.

Now the finished salt made by Datang is very coarse.

As a result, a lot of salt is bitter and astringent.

Li Zheng changed the water again, and this is the sixth time.

Use water at room temperature to break down the impurities in the salt.

In fact, it is a very simple truth.

In the crystalline body of the salt mine, there are two substances, magnesium chloride and potassium chloride.

These two substances are the real culprits that cause salt to be bitter and astringent.

In the Tang Dynasty, where chemical knowledge was scarce, people simply did not know how to extract these two things and how to leave the purer sodium chloride in the salt mine.

Chemistry knowledge in junior high school is only, Li Zheng is looking at the salt mine that is still bubbling in the water.

Sodium chloride does not dissolve easily in water at room temperature.

Sodium chloride has a higher melting point than both magnesium chloride and potassium chloride, but they are more likely to dissolve in room temperature water than sodium chloride.

Li Zheng looked at it with a smile, trembling, mortals of the Tang Dynasty!

You're about to see the cleanest fine salt in Datang.

That night, Li Shimin received the reward.

Li Zheng mashed the salt mine and soaked it all in water.

And you still have to soak it all night.

Li Shimin couldn't understand what Li Zheng was going to do, so he just waited to see if Li Zheng could come with fine salt.

On the second day,

The old eunuch stared at Li Zheng's movements, still the same as yesterday, still soaking in those salt mines.

"County marquis, the water that comes out is salty."

"It's down." Li Zheng said.

"Why did it fall? That water is salty, it's salt water. ”

"The things I brewed out are about as toxic as arsenic, and I won't stop you if you want to drink it." After Li Zheng finished speaking, he felt that it was wrong, and said, "You shouldn't have drunk it yet." ”

Wang Wen's face turned pale suddenly, and he stepped aside and began to buckle his throat.

After Li Zheng finished speaking, he began to make a fire and boil salt.

After a long time, Wang Wen saw that he didn't seem to be in big trouble.

The old eunuch replied, "The old slave dipped some and tasted it, but didn't drink it." ”

Li Zheng ignored him.

The old eunuch said again, "Huh? Why are there so many fewer pigs sent yesterday? ”

Li Zheng continued to boil salt without moving, which is also an indispensable part of refining fine salt.

The old eunuch asked in a low voice, "County Marquis, there are several fewer pigs." ”

"Really?" Li Zheng cleared his throat and looked calm.

"Where the hell did this pig go?"

"Those pigs are sows, and now it's almost spring, and it's the season when sows are in heat."

Hearing this, the old eunuch blinked vigorously, "Huh? ”

Li Zheng said with a serious face: "Maybe they are looking for boars to be happy, and they will come back in a few days." ”

“……”

Wang Wen looked at the situation and asked, "Huh? Could it be that the hens are all looking for roosters to be happy? ”

The fan in Li Zheng's hand shook faster, "Princess, don't you think you're eating?" ”

Wang Wen counted a total of seven pigs.

Thinking that Li Zheng couldn't eat seven pigs alone.

smiled and said to Li Zheng: "The county marquis is definitely not that kind of person? ”

"I kindly refined fine salt for Your Majesty, and you doubt me so much." Li Zheng sighed: "People's hearts are sinister, there is a way to know that the horsepower is insufficient, and the people's hearts are not ancient for a long time." ”

"It's Lu Yao who knows the horsepower, and he sees the hearts of the people over time, and the old slave is of course loyal to His Majesty." Wang Wen smiled, "The county marquis really likes to laugh." ”

The old eunuch's smile was a little oozing.

chatted with this eunuch for a few more words, and then I learned that he and the eunuch Wang Ding next to Li Shimin were brothers.

He is Li Shimin's domestic servant and Li Shimin's most loyal eunuch.

Wang Ding, Wang Wen and six cronies and eunuchs are all doing things for Li Shimin.

Li Zheng asked curiously: "Your name is Wang Wen, is it a person named Wang Wu?" ”

"You said he, he was in the Longwu Army......"

Realizing that he had leaked his mouth, Wang Wen hurriedly covered his mouth.

"It turns out that he is in charge of the Long Wu Army, no wonder the Long Wu Army has always been so mysterious."

“……”

Wang Wen knelt down in the direction of Taiji Palace, "Your Majesty!" The old slave didn't control his mouth, and when the old slave went back, he would definitely ask for his guilt. ”

After boiling the water until it boiled slightly, Li Zheng poured it and changed the pot.

Crystals that have not dissolved after boiling are also not edible.

Next, continue to add the soaked salt ore, plus dissolve in the water on the line, the fire can not be big, the water temperature can not be too high, about moderate warm water can be, the magnesium chloride and other impurities were dissolved in room temperature water before, and now the boiled warm water is dissolved just sodium chloride.

Sodium chloride is salt, and fine salt can be refined by using different dissolution conditions.

Sodium chloride crystals can be precipitated by pouring warm water dissolved in a basin and leaving it to dry in the sun.

The salt pans of Haiyan are such a truth.

It's just that there are a few more steps to make salt from salt ore.

Li Zheng sat aside with a fan in his hand, closed his eyes and began to take a nap.

I don't know how long I slept, but when it was evening, Wang Wen woke him up.

"The county marquis water has dried up."

Li Zheng looked at the basin that had been drained, and gathered the tiny crystals into a pile.

The old eunuch Wang Wen looked at it and said, "County Marquis, these fine salts are so beautiful and white." ”

"I didn't see it." Li Zheng handed it to him and said, "You taste it." ”

"The old slave doesn't dare, the county marquis tastes first."

"If you want to taste it, you will taste it."

"Why didn't the county marquis taste it himself?"

Li Zheng sneered and said, "How do I know if the things I have refined can be eaten, what if I eat the dead?" ”

“……”

Wang Wen dipped his fingers in some salt, and his expression was sad and angry, and he was about to put it in his mouth.

gave up at a critical time, Wang Wen said with a look of grievance, "County marquis, the old slave still has to do a lot of things for His Majesty, but he can't just die." ”

Wang Wen, the old eunuch, called a little eunuch with a relatively high ideological consciousness.

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