That's right...... Yantian, Mo Yun suddenly remembered that the princess had come to show her to this.

She didn't know much about the salt industry, only that salt production was the lifeblood of the country and the benefits were great. However, the salt profit lies in the tax, and it should have nothing to do with the princess, why is Ning Wanjun so concerned about this kind of thing?

When she came to the crystal pool, the princess also took off her shoes and socks, and stepped into the pool with great enthusiasm.

"You're right, it turns out that salt can really be sun-dried. She picked up a pinch of salt crystals mixed with mud and sand, and put them in the sun to look at them carefully, "The Wang family probably never dreamed that we would make the purest salt without even burning a single firewood." ”

"Pure?" Xia Fan raised his eyebrows, "Where is this?" all you have in your hand is the lowest-grade coarse salt. ”

"The lowest grade?" Ning Wanjun looked at Li Duojin in surprise, "Gonggong Li, how is the salt in the palace?"

"Back to Your Highness, it's not much different from this, but it's just crushed and sifted, and it's more delicate. ”

"I'll just say it. The princess poured the salt in her hand back into the water, "The sea salt is bitter, the mineral salt is astringent, and the taste of the well salt is the lightest—of course, the ones who can pay tribute to the palace are generally the ones of the best quality." ”

This time it was Xia Fan's turn to be surprised, didn't they have the concept of refined salt at all? What was in front of them was not an ordinary wealthy merchant family, but the princess of Qiguo!

But if you think about it carefully, the matter of purifying salt is indeed a matter of waiting until the essence of salt is clarified.

"Could it be that you can make it more pure?" Ning Wanjun couldn't help but ask curiously when she saw that his expression was wrong.

"It's not the purest, but at least it removes most of the odors. Xia Fan nodded, "That's the so-called refined salt - fine as dust, white as snow." It's just that this part of the process will greatly reduce the output, so I didn't take it into account in the early stage. If you want to taste it, I can make a little extra. ”

"I want to eat!" Ning Wanjun replied immediately, her eyes full of light.

It was a rarity that the palace didn't have, and she didn't want to miss it.

As fine as dust, as white as snow, it sounds amazing!

In fact, if the princess doesn't mention this, Xia Fan will also refine some of the refined salt by herself to satisfy her and Li's appetite. After all, coarse salt is really not delicious, it is tasteless when you put it less, it is bitter when you put it more, and the rest of the impurities will also seriously affect the taste.

In addition, he did not plan to use chemical purification - coarse salt can at least be eaten, and it will not kill if it is eaten, and if any unexplained reactants are proposed during purification, it will be tantamount to poisoning himself. Therefore, recrystallization is undoubtedly the most suitable choice, taking advantage of the characteristics of salt solubility is relatively stable under temperature changes, it can be the first to filter out those impurities that precipitate faster, and finally evaporate the remaining water, leaving a relatively pure refined salt.

Of course, the accuracy of this physical purification method is limited, and it is still 108,000 miles away from pure salt in the true sense, but at least it will not taste bitter.

Mo Yun stood on the shore, thoughtful.

Although she didn't know how to make salt, she also deduced the general situation from the conversation between the two - the thing in front of her, called the "salt pan", was obviously an unprecedented method of salt making, and it was much better than the current method.

The imperial court must have taken great interest in this technique.

Therefore, when Ning Wanjun looked at her, she bowed slightly, "If the salt pond can be promoted, the treasury of Qiguo must be able to fill it to the brim - the Holy Lord will definitely praise His Highness for this." ”

However, what I didn't expect was that as soon as these words came out, everyone stopped what they were doing and looked at her with their eyes.

Even Gonggong Li frowned.

Looking at this strange scene, Mo Yun couldn't help but take a step back.

What's going on, could I have said something wrong?

"Your Highness...... Are you sure she's your own?" Xia Fan asked in a low voice.

"This is a misunderstanding. Ning Wanjun coughed twice, and then said seriously to Moyun, "I don't plan to report this technology to the imperial court, let alone exchange it for a holy reward." Everything you see today is a secret of Jinxia City, so no matter who it is, you don't want to reveal it, okay?"

"Absolutely. Mo Yun hurriedly responded, but his heart was full of doubts.

And one thing she knew very well was that when she said those words, the people around her became visibly wary of her.

Mo Yun suddenly felt a little bitter.

The two have been separated for too long, even if the past contact is still there, the interpersonal relationships around them are already things and people.

"Let's go back to the lodge first. The princess said.

"I ...... Can you talk to Lord Xia a little more?"

The other party is engaged in the Ministry of Order, and if there is no princess to take the lead, she is not something she can see if she wants to. Mo Yun hadn't forgotten why she was here, and she couldn't be discouraged by this little surprise until she got a definite result.

"Yes. Ning Wanjun put on her shoes and socks again.

"You said he knew a lot, didn't you?"

"In his own words, he knows a little bit about everything. ”

Person...... Quite cautious.

Since that arithmetic book could no longer be used as a breakthrough, she could only start from the field she was familiar with.

After Xia Fan came over, Mo Yun regained his mentality and said, "Lord Xia, you asked me about the research of the Ministry of Engineering before, but in fact, we encountered a very difficult problem. Your Highness says that you may be able to come up with ideas that are difficult for ordinary people to anticipate, so I would like to ask for your opinion. ”

"Wait a minute," Xia Fan stretched out his hand to stop, "Didn't you just say that it was a secret of the Qi Kingdom? I don't want to be wanted by the Criminal Department for hearing this." ”

"That's ...... For outsiders. Mo Yun pretended to be calm and said, "What's more, I also saw the secret of Jinxia City just now, so it should be exchanged." ”

This can be exchanged? Xia Fan silently slandered, I think this is an excuse at all.

However, he is also very interested in the research of the Ministry of Industry, which after all represents the highest level of manufacturing in Qiguo. "Okay, just ask. ”

Mo Yun squatted down and opened the wooden box that he had been carrying with him.

Except for some personal belongings, it is mainly used to store models of trap beasts.

This is also the most critical technology she has overcome.

Mo Yun placed the built-in bronze four-legged beast on the sand, and at the same time injected the qi in his body into it-

I saw the four-legged beast slowly stand up and take steps forward, one left and one right!

"Oh?" Ning Wanjun let out an exclamation, "I remember that this thing was just an idea of yours before, and now it has come true?"

"If you just make it move, the Machine Building Bureau has already made a physical object the size of a cow or a horse. "But in terms of practical application, it still has a key problem that is difficult to solve." ”

Speaking of this, she looked at Xia Fan, "I wonder if Lord Xia can solve this problem for us?"