That's right, what Li Mu wants to do is gunpowder.

As one of the four great inventions of ancient China, gunpowder has a needless to say its status and importance. The exact birth time of gunpowder, but few people know, historical records that until the late Tang Dynasty, there was something similar to 'gunpowder' in alchemy, and the real use of gunpowder in actual combat is a matter of the Song Dynasty.

Therefore, Li Mu's 'invention' of gunpowder now is absolutely unprecedented.

The formula of gunpowder, in the era of Li Mu's school, has long been no secret, the junior high school chemistry class has its formula, the main ingredients are three, charcoal, saltpeter and sulfur, the ratio is fifteen parts saltpeter, three parts charcoal and two parts sulfur, so that you can get the most powerful black powder. But this ratio, after thousands of years of evolution, gradually experimented, the history of black powder formula is not uniform, there is a ratio of 621, there is also a ratio of 421, and the purity of the material and the climate are related.

These three materials for making black powder are not difficult to obtain. Needless to say, where there is wood, there can be charcoal. The other two materials, saltpeter and sulfur, are also found in nature, but they are only slightly more troublesome.

The use of saltpeter in China is very early, as early as the Spring and Autumn Period and the Warring States Period. The first saltpeter collection was troublesome, and saltpeter in nature existed in nitrogen-containing organic matter in the soil, which was decomposed by bacteria, oxidized to nitric acid, and combined with potassium in the soil. In the crisp autumn season, it will precipitate out in the form of salt flowers, covering the ground and the foot of the wall, and the people call it ground frost. Especially in the corners near pigsties, stables, and toilets.

Those who know this will sweep this clod of soil, place it in a bucket, and soak it in water. After filtration, the filtrate is boiled or dried to obtain saltpeter crystals. The earliest method of producing saltpeter was created by a doctor for the purpose of medicine. Later, alchemy arose, and it was mostly used for alchemy.

After the great prosperity of alchemy, the alchemists attached great importance to saltpeter and constantly explored its properties, saying that it was "born of the qi of the sea and the salt, and it is the most divine thing in heaven and earth,...... It can make seventy-two petrified and turn into water, soften the hardware, and refine the eight stones, although the Great Dan is not willing to give up."

In the early Chinese Danjing "Thirty-six Water Laws" that came out in the Eastern Han Dynasty, saltpeter is the protagonist. Saltpeter because of its "fire burning, purple and green smoke rise" characteristics, by the Fangshi is considered to be the immortal thing, so the treasure is important, in the Northern and Southern Dynasties later, where the alchemy, all with saltpeter into the furnace, the consumption is greater. The saltpeter collected by the people is not enough to use, so they can only think of other ways.

Nothing could stop the alchemists' enthusiasm for alchemy, and they finally found an almost inexhaustible source of saltpeter in nature, and that source was the salt lake. Around the salt lake, a large amount of saltpeter will be precipitated, as a kind of solid heat stagnation, abdominal pain, dry stool, intestinal carbuncle swelling and pain, is also a very popular commodity on the Silk Road. Many of the caravans that traveled to and from the Camel Valley were selling medicinal herbs, and it was not difficult to get them.

Sulfur, on the other hand, is even simpler. Sulfurite is mainly found near craters, or in places that were once volcanoes. Around the Camel Valley, Li Mu has observed, tens of millions of years ago, this is an active volcano, otherwise it is impossible to explain the abrupt ridge around, there must be a sulfur stone mine here, find the location of the mine, just dig it will not be used at all.

Charcoal is even better, and every night a bonfire is lit in the Camel Valley, not only for the caravans, but also as a Zoroastrian ritual. You only need to burn charcoal by the way when the bonfire is lit, and it is not a difficult task.

In order to prevent the formula of black powder from being leaked, Li Mu deliberately made a huge list, and he wrote all kinds of messy things into it, just looking at this list, it is impossible to know the formula of gunpowder.

It is worthy of being the most well-established Jin family among the four surnames of the Yin clan, what Li Mu needs, it was quickly prepared, Li Mu drove everyone away, locked himself in the room, prepared food to replenish his physical strength at any time, bought the formula of gunpowder from the system, and also had an intermediate mechanism formula [Landmine].

Landmines, in most people's consciousness, are a product of modern times. But otherwise, in fact, there were mines as early as the Ming Dynasty, but the power was not so great, and it was not so safe, and it would return to the tide when it rained, and the mines would be useless. When landmines were first invented, to deal with mines, it was only necessary to sprinkle water, and there was no great effect on the battlefield.

But in the current situation, it couldn't be more appropriate.

Li Mu planned to make hundreds of mines to be buried in the eastward path of the Turkic army, so that when the Turkic army passed, it would blow them up. At the same time, the gunpowder was buried on the top of the mountain, the mountain was blown down, the pass was sealed, and these Western Turks were forced to take a long detour to achieve the purpose of buying time for the Tang Dynasty.

The Jin clansmen happen to be helpers who can help him plant explosives.

After half a day's busyness, Li Mu had already made more than 20 mines, all of which he carefully put in the box, and in another half a day, there would be fifty, and these fifty would be buried in the pass at night, and they would be buried in half a night.

Knock knock,

There was a knock on the door, Li Mu stopped, came to the door, and asked sideways, "Who?" ”

"It's me."

Li Mu opened the door and saw Jin Chen coming over with a pot of tea, Li Mu glanced at it and said with a smile: "I didn't expect to be able to drink Chang'an's tea here, I thought you were drinking tea soup here." ”

"Chang'an's tea has long been popular in the Western Regions, before I went to Chang'an, the merchants brought it over, but the price was expensive, a tea tea is one or two gold."

"So I'm still selling it cheaply in Chang'an." Seeing that Jin Chen was about to put down the tea, Li Mu stretched out his hand to block it and said, "Don't put it down, I won't drink it." ”

Jin Chen looked at Li Mu, his eyes were full of tears: "You still don't believe me." ”

"I'm sorry, I can't believe you, I can't help but remember it for a long time." Li Mu said indifferently: "I am still staying here, firstly, for the sake of faithfulness, I must do what I have said, and I don't want to owe favors to you what I promised you." And then for my Tang Dynasty, the Western Turks invaded, as a Tang Dynasty military marquis, I had to do something, nothing else, I hope you don't misunderstand, don't look at me with this kind of gaze - the bird I asked you to find, did you find it? ”

"I didn't find a pigeon, I found a harrier eagle, in a cage outside."

The harrier eagle is what the folk call the 'bird eagle', it is not enough to see compared to the eagle, but compared to the bird, it is also a predator. It is very widely distributed and can be found everywhere in the north.

"Harrier Eagle is fine, bring it."