There's a dialectic here. Pen "Fun" Pavilion www.biquge.info

As the saying goes, the sword has two edges, and there will always be two sides to things.

In terms of physiological health, sea salt is the least toxic, and salt decomposition is the most toxic. However, the firecrackers made by sea salt refining nitrate are not powerful, and salt refining can obtain high-grade fire nitrate with higher potassium nitrate content.

Complete purification is never possible. Think about why later generations would have traveled thousands of miles to import nitrate ore from Chile. In fact, this means that even in the 21st century, the cost of the most depressing chemical technology, the separation and purification of those things, is higher than that of ocean-going trade that spans half the world.

In the 21st century, the cost is still high, let alone the Northern Song Dynasty. In fact, in the 21st century, we also rely on overseas imports of sulfur.

Regarding gunpowder technology, Sun Shengli and Kuai Fei take a completely different perspective.

Kuai Fei doesn't have high requirements for his future, as long as he can increase the blasting power by three or five times on the existing basis, he feels that he can do it. After all, the starting point of the Northern Song Dynasty was very low, and the gunpowder of the Northern Song Dynasty, that is, the Chinese black powder that was ahead of the world and was affectionately praised by the German old horse, had a pitiful potassium nitrate content of only 2%-10%. The starting point is low, and the benefits of improvement are obvious.

Sun Shengli's focus is on the cause of Mr. Song and the Song Group. The Song Group doesn't need this ancient secret recipe at all. There's no need for Brother Sun to waste too much energy here.

The salt eaten by the soldiers of the Western Army was of poor quality and poisonous, which blamed them for their bitter lives. This is a historical limitation, not something that a time-traveling criminal should meddle in. Sun Shengli himself is also miserable! Isn't that also a matter of history? Who can be blamed for this? I can only blame myself for my miserable life.

However, our brother Sun is not an absolutely cold-blooded and ruthless person......

There is such a small favor, which can help the Great Song Dynasty, and by the way, help the military and civilians of the Fifth Road in Kansai.

Sea salt is less toxic, and the tofu you order is healthier to eat. So tofu was first invented in Anhui. Anhui is next door to Jiangsu, Jiangsu has Yancheng, Haizhou (Lianyungang). When Anhui chemists were ahead of the world in synthesizing the world's first piece of tofu by chemical means, they undoubtedly used sea brine. With good salt in hand, who would travel thousands of miles to buy worse quality Northwest red salt to play.

As a result, the chemists of the Han Dynasty mistakenly missed the opportunity to invent black powder in advance.

Shanxi salt point tofu, as a finished tofu, is undisputed, will be worse and more harmful to health than those produced in the coast. However, as far as the leftovers of semi-finished products left after ordering tofu, what remains after ordering tofu is really waste. After the salt and brine are desalted and the tofu is dissolved, the marinade with a higher concentration of potassium nitrate can be obtained in the remaining leftovers. Use this marinade to cook nitrate, and the purity will be much higher. The blasting power of the black powder produced in the later stage will also increase exponentially.

This is the unexpected blessing of Seon's lost horse.

This is also the key reason why Gongsun Sheng thinks highly of Guan Yu, Guan Sheng, Fan Zhongyan, and Fan Chun.

A tofu merchant who was born in Yanchi, Northwest China, happened to combine salt detoxification chemistry with tofu chemistry...... These two ancient basic chemistry may surprise when they come together. Of course, it is also possible to be overlooked by careless chefs. It is also possible that because the concept of Taoism deviated, he finally ran to refine the so-called Xuanbing beads that contained the true martial power of the north.

Well, this Guan family was born with a unique fortune, and they were born with this intersection. Whether or not they can trigger a surprise discovery in chemistry depends entirely on their own fate.

It just so happened that the ancestors of the Fan family forced Yanchi in Shanxi, Xi'an in Shaanxi, and Lingbao in Henan to merge in a special administrative region spanning three provinces. The ancestors and grandchildren of the Fan family also have this fate, and whether they can make scientific and technological discoveries depends on whether their own fortune is deep enough.

Theoretically, Gongsun Sheng didn't plan to intervene, but ...... Is it okay to give them a hint? Is it okay to steer them in the right direction, or give them a boost?

As soon as Sun Laosi heard that Guan Laowu, the master of the fairy tofu technology, claimed to be surnamed Guan, he was overjoyed in his heart. The heart said that the country is very fortunate, the Great Song Dynasty is fortunate, and the northwest border is very fortunate. As long as my fifth brother is not too stupid, with a little allocation, he can actually easily make a powerful version of the firecracker, right? At the same time, it has also greatly reduced the content of nitrate poison in the salt of the Northwest Pond, so that the military and civilians in the Northwest can eat salt more assured, and the average life expectancy of people can be extended a lot.

In this way, Sun Shengli is also very satisfied with being able to help the locals.

So as soon as Guan Shengfu in the kitchen made a move, Gongsun Sheng immediately dodged to the side and back. He should have rushed over to fight with the other party in a rage, that is, he guessed who the other party was, deliberately tolerated it, and refused to fight among himself.

While dodging, he called up his own system egg......

This system egg can identify itself. If Guan Lao Wu is also among the same people, he will understand it at a glance. If he is an Indigenous NPC, this system can also help avoid most physical attacks. Just kidding, this is a descendant of the Martial Saint, Sun Shengli really didn't want to be tough with Guan Erye's heir.

Don't be stabbed in the head, just split it in half vertically.

I didn't expect that this level of Lao Wu would not give the system egg face at all. He didn't perform the swordsman's trick either. With a long-handled soup spoon in his hand, he kicked open the kitchen door, brandished the soup spoon, and smashed the floating system egg in the air one by one.

I missed the first shot. The evasion ability of the system egg is still very bad, after all, it is the principle of program control in the future era. Computers are obviously more responsive than human nerves.

The second hit missed.

Then Guan Lao Wu was obviously in a hurry.

Both shots missed. This Guan Lao Wu's face was red, probably a little embarrassed. Show real kung fu.

With his feet in place, he unfolded a mysterious footwork in the backyard. In a moment, he kicked all the debris piled up around the yard. There was dust flying in mid-air, straw and firewood dancing together, eggs and bean dregs flying together.

This is also the origin of the crackling sound that Li Mianlan heard in her ears.

Guan Lao Wu's trick is really useful. The system egg was quickly blindfolded. The system can't determine which of the targets is the real target to avoid.

And then...... Because the amount of computation is too large......

This useless sci-fi thing is actually down!

Smack. The system eggs fall to the ground. The system is paralyzed, and the egg no longer rotates.

Guan Lao Wu took a step and stepped on the system egg.

"Demons! Look where you run. This was clearly said to the egg.

Sun Shengli can now be sure that this level of Lao Wu is not a crossing criminal. He and Wu Song's situation is probably similar. They are all local people. More strange abilities than 100% pure indigenous NPCs. But it's not a character who has traveled through time.

So...... With such an indigenous high-energy NPC, how do you explain everything that just happened?

……