Under the dim oil lamp, there was a faint stench in the room.

The post station is not better than at home, the lamp oil at home is made of the oil of the tree to add spices, it is resistant to burning and has a faint fragrance, it is very useful, but the price is slightly more expensive.

Ordinary people use rapeseed oil, and those who don't have money use flax oil, sesame oil, and even tung oil, but the taste is extremely unpleasant.

As for the candles, they are all made of qualmium oil and other oils, and most of them are used as tallow in the north, and the price is still relatively expensive, so most people do not have these things at home.

Thinking of this, Zhang Mu suddenly thought of a way to make money, although there were many disadvantages in ancient times, but anything made casually was a good way to make money, and his heart was a little balanced.

When making soap, the grease is saponified, but the leftovers cannot be used to make candles, because there is glycerin in it, and there is a strong smell when burning, but it can be extracted from soap with hydrochloric acid, although it is not as economical as paraffin candles, but it is also much cheaper than the candles sold now.

After all, paraffin wax is to be refined from oil, and now there is no such process, and there is no such ability, but this stearic acid candle can also be sold very well, which not only solves the problem of making soap scraps, but also can further develop oil profits and reduce production costs.

Thinking of this, Zhang Mu was a little proud, but the problem of hydrochloric acid is a little troublesome at the moment, but hydrochloric acid can be made of edible salt and sulfuric acid, thinking of this, Zhang Mu smiled bitterly: "It seems that we have to start with sulfuric acid first." ”

Zhang Mu pondered for a long time, the most reliable way is to use blue alum to make sulfuric acid, blue alum can be bought in traditional Chinese medicine stores, and it is not a scarce thing.

At 160 degrees, blue alum can lose water and become anhydrous copper sulfate, but at 700 degrees, it can decompose into copper monoxide and sulfur trioxide.

The temperature of the charcoal kiln to make porcelain and lime can reach more than 1,000 degrees, so the temperature is not a problem, but sulfur trioxide is not easy to collect.

Zhang Mu pondered for a while, and felt that it was necessary to use porcelain to burn a pipe, and then study a set of blower equipment, and then introduce sulfur trioxide into water, which can be made into a dilute sulfuric acid solution, and then boiled into sulfuric acid.

With sulfuric acid, if you don't like anyone in the future, you will splash him in the face, but it is a good thing to travel at home and kill people and goods.

Moreover, glycerin can be extracted by saponification of oil, and nitric acid can be obtained by concentrated sulfuric acid and saltpeter. A mixture of concentrated nitric acid and concentrated sulfuric acid, plus cotton treated with caustic soda, that is, defatted cotton, can be made**.

However, ** is not very stable, it will explode when you shake it, Zhang Mu will not go ** for the time being.

However, this method obviously worked, so Zhang Mu hurriedly picked up a pen and wrote it on paper, and when he returned home, he instructed Zhang Wenguang to burn the ceramic pipe first and make a wind box.

"Ring the gong to inform, close the doors and windows, and be careful of the candles" followed by three gongs, Zhang Mu saw that it was four watches, and hurriedly got up and walked towards the door.

Back in the dungeon, Zhang Mu saw Li Guan leaning against the wall and staring in confusion, Zhang Mu opened the cell door and shook Li Guan gently, Li Guan suddenly opened his eyes, and when he saw Zhang Mu, he asked, "Can I go?" ”

"Follow me." Zhang Mu whispered, then led Li Guan to the back corner door, and whispered, "Do you know where Duan Tiande lives?" ”

"I know that he has an industry in the Flower Basket Lane behind the City God Temple. I've been there once. Li Guan said.

"Then you go, don't worry, I'll give you a full set of dramas here, you go." After speaking, Zhang Mu opened the corner door.

Li Guan looked back at Zhang Mu, hesitated for a moment and said, "What you promised me, you can't be untrustworthy!" ”

"Don't worry, I'm all talking." Zhang Mu said.

Li Guan gritted his teeth and said, "Farewell." With that, he leaned against the wall and limped into the alley.

Zhang Mu turned around and returned to the stable, at this moment someone had already prepared hay here, Zhang Mu woke them up, the two lieutenants hurriedly squatted down and lit the fire, a moment of effort, the huge backyard fire.

"It's water, it's water." At that moment, there was a gong in the backyard, and then the Jinyi guards who lived here went out of the house one after another, but they were just pretending and did not go to put out the fire.

Anyway, the fire couldn't be burned, and after a while, about a dozen Jinyi guards went out from the main gate, divided into two teams, and rode horses to search for Li in Jinhua Mansion.

Zhang Mu looked at all this coldly, he planned it all single-handedly, just to act realistically, otherwise Li Guan fled over there, and it didn't look like it.

Jiang Xuan, who was yawning, obviously didn't sleep, and when he saw Zhang Mu standing in front of the fire in a daze, he asked, "Is Li Guan reliable?" ”

"It shouldn't be a big problem, when it comes to his parents, it obviously feels like he still cares a lot." Zhang Mu said.

Jiang Zhen asked puzzledly: "This kind of person has been fighting for half his life, where did you see it?" ”

"When I mentioned his parents, his hands and feet trembled slightly, his breathing rate increased, his eyes were glazed, and he was obviously nervous about his parents. That's why I'm sure I'll be able to convince him. Zhang Mu said with a smile.

Jiang Zhen glanced at Zhang Mu up and down and said, "Where did you learn this thing?" Do you know these experiences that the old man has only had after interrogating prisoners all his life? ”

Zhang Mu hurriedly explained: "This is all from an ancient book. I thought it was a joke, so I didn't care, but later my father burned the ancient book, saying that I was not doing my job. ”

"It's a pity, it's a pity. But his mother's reading is really useful. Then let's wait for Li Guan to come back. Jiang Zhen said with a smile.

"My lord, there's one thing I haven't explained." Zhang Mu said in a low voice.

"Oh? You say come and hear it? Jiang Zhen said.

"Li Guan is gone, and he will not come back, because he will be killed and killed. Then what he said about Duan Tiande is definitely problematic. If Li Guan comes back, at least it shows that this Duan Tiande, the problem is not big, how can a person who dare not kill people assassinate His Majesty? Zhang Mu whispered.

Jiang Zhen suddenly understood, Zhang Mu used Li Guan is to throw stones to ask for directions, it seems that he has already thought about it, Jiang Zhen subconsciously felt that Zhang Mu, a thirteen-year-old child, is more scheming than an adult, and has to be said to be talented.

Zhang Mu continued: "If Li Guan doesn't come back, we will have a goal, and we won't have to worry about asking anything." If Zhang Chi and his party really have something to do with His Majesty's travel, then my lord, I'm afraid this case will be troublesome. ”

Jiang Zhen nodded heavily, and Zhang Mu said again: "My lord, I promised Li Guan to release his family, and I also asked your lord to call the shots." ”

"Don't worry, what this official promised you, you won't break your promise. Ming rì I will inform the government to let them go, the hour is not early, Ming rì put the row, you go to sleep. Jiang Zhen said.

"Then the lord takes his leave." Zhang Mu yawned, then turned around and answered in the room.

————————————————————

Comrades who like this book, please collect it, thank you.

;