Hand over the jade seal first [Infrastructure]

The black gunpowder has been made, and the signal bomb is not so difficult. It is to adjust the ratio on the original basis, and then add various metal elements to make the flames have various colors.

Xiao Zirong didn't do it before, mainly because metal elements are not easy to find, and Taoyuan City doesn't need remote warning, just shout for such a close place, and there is no need for that thing.

If you really want to do it, it is a waste of manpower and material resources. If you have that time, it is better to let people go to farm.

But now in the slack state, everyone is relatively relaxed, and there is time. As for raw materials, isn't there an almighty regent?

Xiao Zirong was not in a hurry to start, but started looking for various formulas.

If you want to use existing materials and craftsmanship to make signal flares, you need to make many changes on the basis of later generations of signal flares, and some places even require more cumbersome craftsmanship.

The only thing that is difficult to get right is probably the proportioning. Xiao Zirong is also a little annoyed, and he is going to make some measuring instruments, or else he can't just rely on his feelings in the future?

In fact, Zhai Xi and the others also have some relatively simple instruments in their hands, but they are not accurate enough.

Xiao Xuexing watched Xiao Zirong start writing and drawing after finishing the book case, looking very focused.

Wei Yun next to her was a little at a loss, so...now...how to deal with the matter of the granary?

Xiao Xuexing saw her confusion, and slapped her to retreat for the time being. Anyway, the matter had to wait for the results of Ling Fu's investigation.

Ling Fu didn't come too late, he came back when Xiao Zirong was still copying the formula from his mind.

As soon as he came in, he saw Xiao Xuexing put on a silent posture, Ling Fu glanced at Xiao Zirong walking over on tiptoe, bent down and whispered a few words in Xiao Xuexing's ear.

Xiao Xuexing couldn't hold back a sneer after hearing this.

Xiao Zirong was originally immersed in the world of mathematics, physics and chemistry. Generally, when he started to concentrate on doing something, he would rarely be disturbed by the outside world, but for some reason, when Xiao Xuexing was by his side, he was very concerned about Xiao Xuexing's every move. Very sensitive.

Hearing the other party's sneer at this moment, he couldn't help but look up at Xiao Xuexing.

Then I just heard Xiao Xuexing lower her voice and say: "Does this mean that the king didn't let them eat enough before?"

Ling Fu trembled for a moment and realized that Xiao Zirong raised his head, so he couldn't help but look over for help.

Xiao Zirong stopped writing and asked, "What's wrong?"

It was rare for Xiao Xuexing to keep a straight and handsome face, and he was really too embarrassed to say such words.

Ling Fu on the side could understand the leader's idol burden very well, and said cautiously: "The subordinate just went to ask, and then... the rice cooked by the little ladies is so delicious, so everyone ate more."

Xiao Xuexing was a little annoyed as he listened, feeling as if he had raised a bunch of idiots.

But Xiao Zirong blinked and didn't react for a while, and said after a while: "Oh, that...it doesn't matter, I thought there was some other problem, so...it's all right."

He has already imagined a lot, for example, someone is smuggling food, or another outsider has mixed in, but he never expected it to be such a ridiculous reason.

Xiao Xuexing said: "Don't get used to them, since you've eaten so much, let's practice more from tomorrow."

After hearing this, Ling Fu simply agreed, anyway, it wasn't him who practiced extra, those unlucky kids really went to other people's houses to eat and drink, even if King Xuancheng was His Highness' younger brother, they couldn't do that.

Xiao Zirong coughed lightly, lowered his head and continued to study his signal flares.

At this stage, it is actually not easy to make signal flares. First of all, besides saltpeter, sulfur and charcoal, the signal flares also need to be added with adhesives, which can play a role in slowing down the combustion. Otherwise, they will explode directly like black powder. Too short, and can not play the role of early warning.

Adhesives are generally made of rosin, shellac and natural drying oil, which is easy to find, so the remaining problem is how to make the signal flares burn in other colors.

The color of the signal flares is controlled by metal salts, which can emit different lights according to different metals.

Among them, yellow and green are not difficult. Yellow can directly add natural cryolite, green can be added with copper powder, and only red is the most difficult because strontium is needed.

Xiao Zirong researched for a long time and found that the most easy to obtain is probably strontium carbonate, using celestite and coal for coal reduction method to obtain strontium carbonate.

Of course, he wrote down all the steps, whether it works... that's another matter.

Because it can also be said that the time is tight and the tasks are heavy, Xiao Zirong went directly to Zhai Xi to start researching these things, because he was too involved to have time to hang around with Xiao Xuexing.

Xiao Xuexing didn't mind either, he walked around Taoyuan City every day, and occasionally chatted with some brave ladies.

He needs to restore a Xiao Zirong that he has never known from more people.

Xiao Zirong in front of him is as well-behaved and obedient as three years ago. If he feels that he has done something wrong, he will look at him pitifully, making Xiao Xuexing reluctant to speak harshly, for fear that if he talks too much, he will see his brother's teary eyes again. Wang Wang ground look.

However, in the eyes of these little ladies, Xiao Zirong is probably the kind of real man who doesn't talk too much and never looks back at the explosion.

Everything he does has a strong sense of purpose and mostly achieves his goals, and even exceeds them.

He never procrastinates in doing things, and never swallows his anger.

A completely different Xiao Zirong was almost separated from his performance in front of Xiao Xuexing.

The more Xiao Xuexing inquired, the more interesting he found it. Every day, besides finding ways to understand what Xiao Zirong had done, he ran to the Ministry of Industry to catch Xiao Zirong back to rest—this little coward would forget the time when he was busy. One day, he came back when it was almost dawn, and from then on, Xiao Xuexing would bring Xiao Zirong back to rest and eat every day when the time came.

At first Xiao Zirong didn't dare to refute, although he was very reluctant, but obediently put down what he was doing and followed Xiao Xue.

It's just that gradually he discovered that Xiao Xuexing was actually not that strict, not as cruel as in the legend, and when he was angry, he just stared at him coldly with a straight face at most.

Xiao Zirong became more and more courageous, and later even dared to act coquettishly with him.

After a few days, seeing that the signal flares were all done, now they are stuck on the production of strontium carbonate.

This thing requires lapis lazuli and coal to be crushed and then reduced and roasted at a high temperature according to a certain ratio. The time is between half an hour and an hour. They are currently stuck on this time issue.

After all, I have no experience, and even Xiao Zirong only knows the one in the picture after the burnt state. After many comparisons, I feel that it is similar, but it is not the same.

Finally, the roasting is done, and there are two leaching, one is washing, the temperature needs to be controlled at about [-] degrees, and now there is not even a thermometer, really everything can only rely on the experience brought about by failures.

After a series of twists and turns, it was finally done. It was almost done after the barium was removed with Glauber's salt, but it was time for him to "off work".

When he saw Xiao Xuexing's figure, Xiao Zirong's heart sank. He looked at the raw materials that were still being extracted, and then at Xiao Xuexing. He thought about it and said, "It's still a while, it will be fine in a while."

Xiao Xuexing knew at a glance that it was another tug-of-war, so he simply stepped forward and grabbed his collar and said, "You said the same thing last time."

After waiting for two hours, dinner turned into supper, what kind of a while is this?

Xiao Zirong quickly grabbed his wrist and said, "Really, it won't take more than half an hour, it will definitely be fine, I promise!"

Xiao Xuexing remained unmoved, Xiao Zirong looked around, and found that the people in the Ministry of Industry were busy with the work at hand, if Xiao Zirong left, they would have to share the work Xiao Zirong was doing, so it was not No one watched the two of them—probably because the regent's coming to pick up people in rain or shine has become a regular program recently. Everyone watched it fresh at first, but then they got used to it.

Since no one was watching, Xiao Zirong simply leaned into Xiao Xuexing's ear and said, "Please, brother is the best!"

While talking, he tugged at Xiao Xuexing's sleeve.

Xiao Xuexing couldn't help having a headache, this coquettish spirit really couldn't control it anymore.

Where had he seen such a battle before, children would want to turn around and run away when they saw him, how dare they act like a baby?There are some young gentlemen and young ladies who have unspeakable thoughts on him, but Xiao Xuexing has never looked sideways and ignored it. If there is a little bit too much, just get close to him five feet away It was already thrown out by the guards around him within the range.

Xiao Zirong was the only one in the world who would not be thrown if he dared to do this, Xiao Xuexing stretched out his sleeves with a straight face and said, "What does it look like?"

Xiao Zirong didn't blush either, after many verifications, Xiao Xuexing would talk about it but actually liked him a lot.

So he didn't say much, just stared at Xiao Xuexing with those bright eyes.

Xiao Xuexing closed his eyes, really couldn't bear Xiao Zirong's coquettish and cute offensive, this little coward was more and more like the little wolf cub he had raised before, but that little wolf cub was much more winking than him , as long as Xiao Xuexing is unhappy, he will not go up to him, so he is not like a little counselor.

But from this point of view, the little counselor is a lot more courageous.

Xiao Xuexing pursed his lips and said very seriously: "At most half an hour, no more next time."

Xiao Zirong immediately beamed with joy, his smile was very bright and energetic, no matter how bad Xiao Xuexing was, as long as he saw Xiao Zirong's smile, he could calm down his mood.

Xiao Zirong didn't say much, and ordered people to serve Xiao Xuexing with honey water and snacks, and then plunged into the very simple chemical experiment.

The half an hour he mentioned is not actually the time for making strontium carbonate, but the time to get all the materials together after the production and directly make the finished product.

By the way, Xiao Zirong also improved the lead wire, using paper and saltpeter powder to make the lead wire, and most of these two materials were provided by Xiao Xuexing.

After everything was done, Xiao Zirong happily ran over and grabbed Xiao Xuexing's wrist and said, "Brother, let me show you the warning flare!"