Liu Yin didn't have the intention to hide from his mother, refining gunpowder, in the eyes of the people of the time, it must be an unbelievable thing, if he really wanted to explain it to his mother, Liu Yin would probably have to spend a while.

What's more, out of secrecy, Liu Yin decided not to disclose it to anyone in advance.

The spies of Wei are everywhere, gunpowder is a cutting-edge weapon at this time, Liu Yin will never leak the **, after all, the threshold for making gunpowder is too low, anyone can easily make it as long as they master the formula, the less one person knows, the safer it is.

Liu Yin doesn't mind other people's misunderstandings, the deeper this misunderstanding, the more secure the safety of the formula will be, even if the Wei spies find out that they are "alchemy", they will definitely not think that they are actually making weapons of mass destruction.

However, for the sake of safety, Liu Yin still arranged a large number of guards in the Ma family manor, and the guards were all from the Anping Palace, loyal and reliable. The Ma family manor was originally located near Xiling, inaccessible, Liu Yin deliberately created the image of tight inside and loose outside in the Ma family manor, from the outside, it is almost impossible to see any warning measures in the Ma family manor, in fact, the inside is a bright post and a secret sentry, and the guard is tight, even if it is a fly, it is not easy to fly in.

**There must be a workshop, and if there is a workshop, there must be a craftsman. In the selection of craftsmen, Liu Yin "abused" a little power in his hands this time.

The status of the craftsmen of the Han Dynasty was quite humble, one day as a craftsman, a lifetime as a craftsman, one generation as a craftsman, one generation as a craftsman, a craftsman and a slave, in essence, there is no difference. The freedom of the craftsman in the vital sector, such as the armory, is completely restricted, and not only the craftsman himself, but also his descendants and grandchildren, can only engage in this profession for generations.

This restriction on the personal freedom of craftsmen is completely necessary from the perspective of technical secrecy, such as the Third Weapons Workshop for refining Hundred Refining Swords, and it is precisely because of the strict household registration management system of craftsmen that this advanced refining technology of Shu Han was not stolen by the spies of the Wei State. In the General Department of the Weapons Workshop, there are even stricter management departments, and the Sixth Weapons Workshop, which produces the Yuan Rong crossbow, is even more important, and it is said that the craftsmen of the Sixth Workshop are completely like prisoners, and they do not even have the slightest freedom.

Liu Yin wants to build a first-class workshop, naturally needs a large number of craftsmen, stonemasons, blacksmiths, carpenters and many other types of craftsmen are needed, it is obviously not suitable to recruit idle craftsmen from the society, Liu Yin thought of going to the general department of the weapons workshop.

The head of the general department of the weapons workshop is just a 600 stone official, as soon as he heard that Liu Yin wanted to find some craftsmen, without saying a word, he immediately allocated 200 craftsmen of various types to Liu Yin, and said to Liu Yin with a flattering look, if there is a shortage of people, just ask him for it.

Liu Yin couldn't help but smile bitterly, at this stage, his gunpowder workshop is purely private, and the craftsmen who use weapons in the workshop are completely a kind of behavior of using power for personal gain, because he hangs the seal of the lieutenant Youcheng, this matter has become extremely easy, and two hundred craftsmen are just a matter that the master of the workshop can do with one sentence.

With a craftsman, Liu Yin immediately began to "alchemy" with great fanfare.

From birth to application to the military field, it has gone through a long period of time, the initial production of gunpowder, although it has the function of explosion and combustion, but its efficiency is inferior, so that it has only been reduced to a pyrotechnic display props for a long time, the main reason is that there are strict conditions from the compatibility of raw materials, purification, production and storage, and if you want to improve the efficiency of the company, you must strictly control all links.

The first **war is a full-scale duel between the East and the West**, when the British military used ** both in range and power, it is far more than the Qing army, the British used the results of modern science and technology to teach a hard lesson to the Oriental people who invented **, students surpass the teacher is by no means a dream, backward is destined to be beaten.

In his previous life, Liu Yin loved to read these military historical materials, and he has always remembered the gunpowder production process used by the British army in the ** war, and the best ratio of gunpowder is: 75% nitrate, 10% sulfur, and 15% charcoal.

Of course, the proportion is only a prerequisite, and the subsequent production processes are not allowed to be sloppy.

The first is the purification of raw materials, the higher the purity of raw materials, the greater the explosive power of gunpowder, on the contrary, the more impurities contained in the raw materials, the power of gunpowder will be significantly reduced.

The sulfur and saltpeter produced in Yizhou, in terms of quality, Liu Yin is assured, but the raw materials are raw materials after all, and if they are not purified, they are far from meeting the requirements of the formula.

In this era, the purification of sulfur and saltpeter was done entirely by the soil method, that is, the distillation and crystallization methods.

The purification of sulfur is by distillation, the melting point of sulfur is 200 degrees, the boiling point is 400 degrees, the sulfur is placed in a cauldron, heated until dissolved, the insoluble impurities are removed, the sulfur is continuously stirred and heated to 400 degrees, the sulfur is gasified, and the sulfur gas is collected to cool and dry to obtain high-purity sulfur.

The purification of saltpeter is by crystallization method, using saltpeter with high temperature grass ash water above 90 degrees to dissolve saltpeter, slightly excessive after saturation, filtering out insoluble substances, and then the filtrate is reduced to room temperature to filter out the precipitated substance, and the precipitated substance is a purer saltpeter. Grass ash water can react with various calcium salts, magnesium salts and iron salts in nitrate water to form carbonate or hydroxide, and the precipitation is removed. This process is repeated many times, and high-purity nitrate can be obtained.

Charcoal is made of high-quality paulownia wood, paulownia charcoal powder is a light and easy to fly powder, the lightest of all charcoal powder, and the best combustion effect after mixing with sulfur and nitrate, is the first choice for making high-power **.

In the gunpowder workshop, Liu Yin adopts an assembly line production method, which can improve production efficiency and ensure that secrets are not leaked. The craftsmen on each assembly line can only master one technology, even if Wei Guo can capture a part of the craftsmen in the future, he can only master this part of the process he knows, unless Wei Guo can catch all the craftsmen on the assembly line in each process, it is possible to master all the processes of gunpowder production, but where there is a missing link in the middle, it is impossible to make **.

After all, once this powerful new weapon is put into the battlefield, it will certainly be coveted by the enemy, and the enemy will certainly do everything possible to obtain the production method of this weapon through various means, and how to keep it secret will be the most important thing, Liu Yin will take precautions and never allow the process of gunpowder to fall into the hands of the enemy.

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