"Coal?" Lu Wenfeng blinked and asked, "Did you use coal stones to make irons?"

Li Mu nodded.

"Uh..." Lu Wenfeng didn't know how to answer. He couldn't figure out what Li Mu meant. This is something that even a child in Huangkou knew. Do you don't know? Or did he pretend to be confused and want to take the school exam with me? No, no, what's the point of taking the school exam? Is it just to find fault? But I didn't offend him!

The more I thought about it, the more confused I felt. Li Mu looked at Lu Wenfeng's face changing and said, "Dr. Lu, if you are really uncomfortable, I will allow you to take leave and go home..."

Hearing the word "Go home", Lu Wenfeng immediately woke up and said repeatedly: "Sir, the lower officials are not uncomfortable. The lower officials actually know, but the lower officials... The lower officials don't understand why the lord ask such a superficial question. Sir, if the lower officials have offended the lord, please make clear that the lower officials are not young and cannot withstand the scare."

"I really don't know!" Li Mu said helplessly: "I came from the marquis and we don't have coal stones there. How do you know if it can be used or not?"

"So that's how it is!" Lu Wenfeng breathed a long sigh and explained: "Sir, coal stones have a strange smell when burned. It must be ventilated. If it is not ventilated, people will be poisoned by coal. It is cold in winter, doors and windows are closed and the ventilation is not smooth, so coal stones cannot be used for heating." As he said, Lu Wenfeng sighed and said: "There are also extremely poor families who are forced to use coal stones to keep warm. If their lives are not good, they will die."

"That's the matter..." Li Mu looked dazed and knew it. It seemed that in this era, raw coal was used. Because there was no coal washing process, coal contained a large amount of ash and sulfur. These components would produce a large amount of toxic gases after burning. At the same time, the air circulation in winter is not smooth, and it is easy to produce carbon monoxide if the coal is not completely burned. Those who died of carbon monoxide poisoning are mostly poisoned. People in this era do not understand the reason, so they call it "toxic".

But these things can be solved! Even if it is difficult to prepare coal, don’t forget that it is now the Tang Dynasty, where no one has moved mines everywhere. Those coal with a lot of impurities are not needed. Some are open-pit coal mines, and one can always find a low-impact content by digging. And Li Mu still remembers that there is something called anthracite. Although he doesn’t know where it is, he is the Minister of Works and can send someone to find it!

Find it and dig it! With coal, everything is easy to do!

When Lu Wenfeng saw Li Mu's eyes, he was shocked. What's wrong with the Minister today? Why are he asking some brainless things?

"Dr. Lu, I'll ask you one more thing. Where can I dig coal?"

"Coal stone is not uncommon. There are coal stones near Chang'an, such as Bin County, Changwu County, Tongchuan and other places. However, the most numerous places are Shuozhou north of Taiyuan, where there are pits and valleys, and it is everywhere."

"Taiyuan..." Li Mu murmured and said, "Taiyuan? Yes, Taiyuan, Shanxi! Why did I forget this!"

Li Mu slapped his thigh and secretly scolded himself for his bad memory. He learned geography in junior high school in vain, but he actually forgot about Shanxi. It was winter, so I had to hurry up!

"Dr. Lu, you are very good. I will give you one thing to make a list of the places you know about iron, coal, copper and other minerals. I will send it to my mansion before noon tomorrow. Before this matter is completed, I will put everything else first!"

After Li Mu said that, he left in a hurry. Lu Wenfeng looked at Li Mu's back blankly, not understanding what he was going to do. He shook off his sleeves and wiped the place where Li Mu sat. He picked up a roll of files, thought about it and put them down, found paper and pen, and made a list according to Li Mu's wishes. Lu Wenfeng had been in the Yu tribe for decades, and he had already understood the origin of various minerals and didn't have to check it.

Li Mu left Lu Wenfeng and brought Li Chongyi and a few guards to the material pile yard of the Ministry of Works. He has now been promoted to the Minister of Works and is the actual head of the Ministry of Works, so the material pile yard is naturally completely open to him. He only needs to give him an order and someone will withdraw it. But the accounts must be recorded, otherwise Li Mu will sell these things and the person who is in charge will be the ones who are in charge.

Li Mu collected two trucks of iron ore and three trucks of coal. He was pulled by several thin horses from the Ministry of Works and returned to Zhulu Hou Mansion tremblingly. These thin horses seemed to have never walked such a long way, and almost lay on the ground when they arrived at the door. Li Mu couldn't bear it, so he took a few coins of money to the handlebar and asked him to buy fodder to feed these meritorious horses from the Ministry of Works. At the same time, he put the establishment of the Ministry of Works and the establishment of the Ministry of Works and the agenda in his heart.

With Ergou's help, Zhang Tianai was very successful in purchasing grain. He paid the deposit at three grain and rice shops and made a contract. At most two days, the grain needed by Zhangjiazhai could be raised. Zhang Tianai was idle, and in the afternoon, he followed Bai Qiaoqiao to visit the East City. Finally got what he wanted and bought the rouge powder from Chang'an City.

Zhang Tianai likes rouge and water powder, but she doesn't like ordinary women. She bought rouge and water powder, which rarely used to apply, but used to collect. Just like many people in later generations bought sneakers not for wearing, but for posting to Moments.

The climate of Longyou is dry, with wind and sand everywhere. I rode a horse out for a walk, but when I came back, I was covered in dust and had no lover. Who did I wear rouge for? She bought rouge only out of a woman's instinct.

Not only rouge, but also clothes. As the eldest lady of Zhangjiazhai, no one can do without her. From childhood to adulthood, she has many beautiful clothes. She basically has popular styles in the Central Plains, but she hasn't worn them much. She grew up in Zhangjiazhai and saw all the horse bandits. The environment is not suitable for wearing, and because her father has no son, she must bear some things that should not be borne by her daughter. Can she wear silk when riding horses and shooting archery?

Therefore, Zhang Tianai's daughter's clothes were all worn inside, and she would always wear leather armor on the outside. With her armor on her body, there was no difference between men and women. This time, she came to Chang'an to sell fur. In order to facilitate her behavior, the clothes inside and outside were replaced by men and did not bring any of the women's clothes. Seeing this, Bai Qiaoqiao secretly bought her two sets of the most popular skirts in Chang'an in the East City, and she had to let her change them. Zhang Tianai was embarrassed, and one of them persuaded and the other was hiding, making a fuss.

Finally, with the help of Li Zhien, Zhang Tianai still never stole Bai Qiaoqiao and half-pushed and changed her skirt to the place. Zhang Tianai was already beautiful, slender, and usually looked a little masculine because of her dress. After changing into the skirt, it was very different. Even the heroic spirit between her eyebrows seemed to be much weaker, but it was just less charming than ordinary women.

Bai Qiaoqiao smiled and touched Zhang Tianai's chest, saying, "Sister Tianai, always wearing a tight breast will cause qi and blood. How good do you think this is?"

"You!" Zhang Tianai said helplessly: "You are going to die. Qiaoqiao, why didn't you find yourself fooling people like this before? You must have learned from your bad husband."

"No..."

Bai Qiaoqiao was about to speak when suddenly Li Mu's voice came from outside the house: "Who is talking badly behind my back? Why am I a bad husband..." Li Mu walked in and saw Zhang Tianai wearing a robe skirt. He was stunned for a while and spit out a 'Wow'.

Zhang Tianai was so embarrassed that she hid behind Bai Qiaoqiao, but she was half a head taller than Bai Qiaoqiao, so how could she hide? Bai Qiaoqiao pulled her from behind and smiled and said, "Sister, you scared your husband. Husband, didn't expect that Sister Tianai was so beautiful in a robe skirt, did you?"

"I didn't expect it, I really didn't expect it." Li Mu told the truth. Li Zhien, who was next to him, rolled his eyes secretly when he saw this. My stupid lady, I have never seen such a stupid woman. Is he not too many rivals in love? He was already a beauty when he was wearing armor, and you helped to dress up... If this continues, you will have to help arrange the marriage in a few days!

"This skirt is very good, it suits you very well!" Li Mu couldn't help but praise him again. Seeing that his tone was sincere, Zhang Tianai also felt very helpful. He held back his shyness and looked at Li Mu, asking, "Is it really good?"

"Well, it'll look better if you put on some makeup."

"Yes!" Bai Qiaoqiao took the rouge bought by Zhang Tianai, shook it in front of Li Mu, and said, "I bought rouge too, here."

Li Zhien couldn't stand it anymore, so he turned around and hid out. Why did he follow such a careless wife?

Li Mu was quite aware of it and didn't leave to see Zhang Tianai put on makeup. He asked a few simple questions whether the work was going smoothly today. After receiving a positive answer, he left and went to the studio in the front yard to work hard. At this time, there was still some time before supper, and he was about to sort out what he wanted to do next, prioritize and order so that he would not be in a hurry.

Bai Qiaoqiao's makeup skills were also slowly figured out after coming to Chang'an. Before, Bai Naoer rarely gave her money, and occasionally gave her a little, so she saved up to help Li Mu's house. She had hardly bought rouge powder. After arriving in Chang'an, Sun took her to Dongshi to buy it, and then Li Mu reminded her several times that she would be willing to spend money. Bai Qiaoqiao gradually bought a lot of rouge powder.

At first, she was not very good at applying makeup. After Li Zhien came, she taught her a lot of makeup techniques and gradually became proficient.

"Okay!" Bai Qiaoqiao touched a plum blossom ornament with fish glue and pasted it on Zhang Tianai's eyebrows, completing the last step of makeup. Zhang Tianai looked at herself in the bronze mirror, and suddenly she didn't know what she thought of, and two blush appeared on her cheeks.
Chapter completed!