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"It's changed, it's changed! Your Royal Highness Princess, look, look, it's really changed! ”

"Yes, it's really changed, okay, now, slowly pick up the national letter."

……

"What...... What the? That...... In the book of the country, there is ...... Got a word? ”

"No...... No way? For...... Why is there a word on the national book after soaking it in water? Difficult...... Could it be that there were words on the national letter? Only...... It's just that we couldn't see it before? ”

"It must be so! It was supposed to be blistered, it was supposed to be soaked, hey, why didn't I think of it just now? ”

"Haha, if you thought about it, wouldn't you be the 'Yongyue Prince'?"

……

There are some things that really don't need to be explained too much, because the eyes will give you the best answer. That's the matter in front of him, come on, those sons and ladies of the "Yinshan Society", some of them are still wondering if Qin Yong is harming Wu Zixiang, because, if this is not the case, he has no reason to let Wu Zixiang go against common sense and put a crucial letter of state into a basin of water to soak. Can a letter that has been soaked in water be restored to its original state?

To be honest, if it is a paper that has been soaked for too long, it will naturally not be able to be restored, and even the handwriting on it will be completely washed away. However, the letter in front of him will not be, because Qin Yong had instructed Wu Zixiang before this, that is, he only needed to dip the letter into the basin a little, and then he could lift it. In this way, although the changes on paper are not too obvious. However, the inner chemistry has already begun. So, it won't be long before you can see the real national letter.

It was precisely with Qin Yong's previous explanation that although Wu Zixiang also felt very nervous during this operation, he did not doubt it after all. waited until the two little palace maids beside her appeared in the national book, and it was really the time when there was a change. She felt even more relieved. Because, Qin Yong didn't lie to her, and she could be regarded as a good fulfillment of the responsibility given to her by Qin Yong.

"There's a word, quick... Hurry up and let me see! Hurry up and let me see! ”

"Hey, don't squeeze it, squeeze it again. But it was crowded with Her Royal Highness the Celestial Princess. ”

"Yes...... But I want to see what the invisible words are. ”

"You can't squeeze it. Crashing into Her Royal Highness the Celestial Princess, can you afford it? ”

"Yes, yes, it's in Xia Menglang!"

……

Knowing that there was a change in the national credentials, everyone present. It was already boiling in an instant, but after all, the distance between most people was too far, so they couldn't see it clearly. What is the change in this national book? And those who were closer to Wu Zixiang, although they did see it clearly at this time. On the originally white and flawless white paper, there are now small pale red characters, but the number of small characters is relatively large, and the volume is relatively small, and they still can't see the content clearly.

"Put away the national letter, it's a big deal, early tomorrow morning, the palace will take it back to the palace directly and present it to my father!"

Well, Wu Zixiang probably meant that he didn't want anyone to see the contents of this national letter. However, there is no way to do this, the national letter is the national book after all, even if your curiosity is great, you can't rush to read it! Otherwise, once this is known by the emperor, I am afraid that it will be investigated, and it will be with the frontier at the lightest, and it may be directly the extermination of the family.

Therefore, the sons and ladies at the scene, although they were still curious about what was written on the national letter at this time, they didn't dare to squeeze it any further.

"Ladies and gentlemen, although the national letter cannot be read, there are still a few blank pieces of paper here, and the same method is used to write on them, so I can show you later."

Just when everyone was disappointed, Qin Yong, who had not spoken out in front of him, suddenly said at this time. It's just that the blank piece of paper he said was taken from Wu Zixiang's hand at this time.

It turned out that when he asked Wu Zixiang to prepare to solve the problem of this letter of state, he also asked Wu Zixiang to get a few blank pieces of paper that were probably similar to this by the way, so that he could give a detailed explanation to everyone present afterwards.

Because, after the previous two competitions, he already understood very well, if he did not explain the mystery in detail and detail, he would not be able to get out of it. Moreover, he has never forgotten his current identity in the "Yinshan Society", that is, a visiting professor of the "Yinshan Society", so it is still appropriate to do more of this.

"Huh? What the? Is this serious? ”

"Of course!"

"Ah, that'...... That's great, so you can explain it to us right away. ”

Hearing Qin Yong say that there were other similar blank papers, the sons and ladies of the "Yinshan Society" at the scene were really overjoyed, so they gathered around Qin Yong's side one after another, "pestering" him and said.

Well, if you want to say "entanglement", that's not very prepared, they just have a little too strong "curiosity". So, Qin Yong had no choice, so he immediately introduced them.

It turns out that the principle used in this is just an ordinary chemical reaction. Because, in nature, many pigments will change with the change of acidity and alkalinity. To be more specific, it is something that may have been colorless, but when it encounters something alkaline or acidic, it produces color. Of course, it may also be that something that was originally red suddenly turns blue, which is all the result of the change of pigment with acidity and alkalinity.

The national letter written by the people of the Great Food Kingdom to the Great Zhou uses this principle. However, at the beginning, Qin Yong didn't know what the raw materials they used were, but. Think, in this era. All kinds of chemicals are not easy to come by, so it must be a pure natural thing, so Qin Yong thought of turmeric, because, under natural conditions, if you use turmeric to write on white paper. Generally, you will just get an almost completely white white paper, but in fact, some substances of turmeric have already stayed on the white paper, as long as it encounters the so-called alkaline water, it will easily change. This change is nothing else, that is, the original word is close to full transparency. It will slowly turn reddish, so it will not be difficult for ordinary people to read it again.

This is actually the principle that there is not a word in the national book of the Great Cannibal. It's just that when Qin Yong started. It's really a headache for that "lye". Because this "alkaline water" is also an extremely rare chemical substance in the final analysis, and in this era, it is not easy for you to make such a chemical substance. Especially in such an emergency situation. Whatever self-made methods are actually not so practical. Because, it takes a certain amount of time to be able to make it. Therefore, when Qin Yong first started, he really felt a headache.

However, he later thought that in this era, didn't he already have zongzi? When wrapping zongzi, many people will use the pure natural alkaline water, that is, the ash produced after the straw is burned, and then after a certain procedure finally get out of a kind of water, this water is actually a simple alkaline water, when wrapping zongzi, if this alkaline water is used, it can make the zongzi not easy to deteriorate, and the taste is quite special. Moreover, this kind of alkaline water, ordinary people should be able to preserve it for a long time, because it is not a matter of one or two days to make it, so Qin Yong guessed that if he could find such a kind of alkaline water, it would be easy to solve.

And the final result of the matter did not disappoint his efforts, because, in this era, the matter of using alkaline water to make zuò zongzi has indeed existed for a long time, and in the kitchen of this farm, there is even such a kind of alkaline water stored, so Qin Yong directly asked Wu Zixiang to go to the kitchen in the back to get it. At that time, Qin Yong also told Wu Zixiang that after the alkaline water was brought, as long as the national letter was put into the alkaline water, the result would have surfaced immediately, but in order to avoid greater damage to the national letter, it must be a dip, otherwise, who knows what this national letter will be ruined into in the end?

"Original...... So that's all there is to it? It's just a piece of turmeric and a little alkaline water used to make zuò zongzi, so it creates the magic of this national letter without a word? ”

I listened to Qin Yong's explanation of this, but as a result, there were still some people at the scene who couldn't believe that things would be so simple, and this is also true, this has already been related to the national book, but how can it just be caused by a turmeric slice and a basin of water that doesn't look very good?

It's just that they don't want to think about it, today's three consecutive competitions, in fact, which one is not extremely simple and easy? But why can't they think of it? And it's just that only Qin Yong thought of it, so whether this is difficult or not, you have to see which person's hand it is, if it is in Qin Yong's hands, it is indeed not difficult, but if it is in their hands, it is simply more difficult than ascending to the sky.

"That's right, in fact, it's not just turmeric that has this effect, there are other things like some colorful flowers, if it comes into contact with alkaline water, sometimes it also changes color, for example, it is originally red, it will become blue, white, but it may become black, it is really quite magical, so if you are interested, you can go back in the future, you can try it yourself......"

Qin Yong finally said. That's what he thinks in his heart, since he has become a visiting professor of this "Yinshan Society", then he will repeat his duties as a visiting professor by the way, anyway, the matter has already been explained to this extent, so by the way, let them talk a little deeper, so what does it matter? So, naturally, he will not be polite.