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Everyone gathered around the long strips of floor tiles on the ground.

"Why didn't I realize it was made of iron?" Mo Shougui muttered. It was so obvious, yet he didn't notice it.

"Normally speaking, we are underground and the exit should be parallel or upward, so we ignored it." Tan Yanlin summed up his experience.

To describe them in one sentence, they are blinded by one leaf.

"The best way to hide is to do it under everyone's nose." Yu Hongdou stroked her head and sighed. She didn't expect this.

"Is this what it means to be a great recluse in a city?" Qian Sanmei rarely interrupted her masters when they were talking.

Yu Hongdou was amused by Qian Sanmei and nodded: "Indeed."

After saying this, she began to circle around Tan Langshuo who was squatting there observing the iron gate.

"It fits perfectly." Tan Langxiu looked up at her. Although he was not sure, he realized now that the iron floor tile was indeed very out of place here.

"I have a solution." Yu Hongdou took a water bag and poured it on the iron floor tile paper.

The water flowed all over the iron tiles and gradually seeped in along the gaps at the edges.

The fact that water can seep in means that there is indeed space underneath.

This discovery made everyone excited and look forward to it.

Yu Hongdou originally wanted to take advantage of the gap in the water flow to pry it open with something sharp. When she was worrying that she would have to use an embroidery needle to pry open such a tiny gap, she suddenly thought of the other two formulas on the wall.

The reaction of concentrated sulfuric acid on iron, the reaction of dilute sulfuric acid on iron.

sulfuric acid……

Yu Hongdou suddenly jumped up, scaring Tan Langxu. He saw her turn around and walk towards the door where the painter's fellow villager lived.

Tan Langxuan didn't understand what was going on and just followed her, but Yu Song was faster than him.

"What are you doing!" Yu Song grabbed his sister and told her to call them if she had anything to do. Why was she running around?

"Brother, go get the alum." Yu Hongdou struggled for a while under her brother's hand, pointed at the [Li] door and instructed her brother.

"Wait here." Yu Song suddenly realized, put his sister down, stood up and walked through the door.

Alum, also known as green alum, is a traditional Chinese medicine and also a pigment.

Its main component is ferrous sulfate. When it is calcined in a sealed container, a chemical reaction will occur to produce sulfur trioxide.

When sulfur trioxide dissolves in water, it becomes sulfuric acid.

Yu Hongdou remembered all this thanks to a time-travel drama.

Of course, we also have to thank this fellow chemistry graduate student. He had already written the formula clearly on the door, but no one connected the dots.

When Yu Hongdou asked Yu Song to get the alum, Mo Shougui had already reacted. He clapped his hands and praised: "That's amazing!"

This praise was both a compliment to the ingenuity of the predecessors' design and a compliment to his disciple for his intelligence in being able to connect the things that he had not noticed just now.

But he also had a question in his mind, that is, how did his little disciple figure out the clues hidden in the formulas.

But this is not the time to ask, and Mo Shougui does not intend to ask. Life is full of confusion, and sometimes knowing too much is not necessarily a good thing.

Yu Song quickly came out with green alum, and then, according to Yu Hongdou's instructions, put the green alum into the crucible that had just been shaken out of the quilt.

The crucible is a standard crucible with a lid, which is just right.

Yu Hongdou was grateful for the complete preparations made by her fellow villagers, and was also glad that they brought a charcoal stove with them this time.

Because they planned to stay in the underground palace for two days, for the sake of safety and convenience, they carried half a basket of silver charcoal and two small three-legged copper stoves for boiling water.

After lighting the charcoal fire and burying the crucible in the charcoal fire, Qian Sanmei even dug out a small copper basin as big as Wangwang's head and a few packs of imperial examination noodles.

"I think eating meat all the time will make it difficult to digest..." Qian Sanmei explained to her young lady in a low voice.

There is no shortage of meat to eat in the mountains. Both Wangwang and the young lady are good hunters. However, Qian Sanmei was afraid that the young lady would get a sore throat if she ate meat continuously, so she asked Aunt Qian for these before going out.

"Third sister, you are so thoughtful. You are simply my sweetheart." Yu Hongdou rocked Qian Sanmei in her arms.

After being influenced by the evil feudal society for five years, Yu Hongdou could no longer go back to the time when she could arrange her own food, clothing, housing and transportation.

Qian Sanmei smiled smugly: "Hehe, as long as the young lady is happy."

"I'll increase your monthly salary when I get back." Yu Song couldn't bear to see his sister being so clingy, so he coughed lightly and promised Qian Sanmei.

Qian Sanmei's eyes immediately brightened up, and she looked at Yu Song gratefully, but the words that came out of her mouth were: "Thank you, Miss."

After the meal, everyone took out the calcined crucible with satisfaction. While waiting for the crucible to cool down, Yu Hongdou held the charcoal stick and listed all the formulas on the wall in a black leather notebook.

The crucible was cold. Yu Song carefully opened the lid, poured water into it, and then carefully poured it around the iron floor tiles.

Others covered their mouths and noses and retreated to the wall. If anything went wrong, they would immediately open the door in the wall and hide in the inner room.

Green smoke rose from the iron floor tiles, and a pungent smell followed. Fearing damage to the nasal mucosa and throat, Yu Hongdou immediately made a decision and asked everyone to hide in the inner room temporarily.

The stone door closed and a moment of darkness engulfed them. It turned out that the lights on the wall were out.

The guard was about to strike the flint to light it, but was shocked by the scene in front of him.

The wall that was originally covered with murals was now gradually emitting light, and the light was getting brighter and brighter.

"Third brother! It's been so many years since the incident, and Baizi is gone. Do you have to pay you with my and your sister-in-law's lives?" Yu Dalang couldn't help but blame Yu Sanlang bitterly after hearing his brother's words.

"Oh, do you dare to pay? I won't waste my time. When Liu was about to come back, you should give Hongdou 10% of the money you got from the division of the family property. I won't ask you for anything else, just 10% in cash. Five taels of silver, give it to me."

Her knowledge of literature and history is average, but she knows that ordinary people in ancient times, especially farmers, should be quite poor?

When the family was divided, Old Man Yu said that there were 250 taels of silver in the family. Yu Hongdou didn't have time to be surprised because the important event of the division of the family passed her by. Only now did she realize how the Yu family could earn so much money.

Although "Man Man Tian Yi" is a farming novel, it carries the banner of a strong female protagonist, so there are many exciting moments.

For example, after the heroine married into the Yu family, she set up a stall openly and earned eight taels of silver on the first day.

Later, he opened a shop, bought land, leased a mountain and built a farm, and the money he spent was often thousands of taels.

She knew that this person was a descendant of an official, but she had no idea how powerful his family background was.

In the later period, the third branch came to power, but this county magistrate was completely invisible. We only know that there was a bigger force behind Yu Song and Yu Sanlang. Every time he appeared, he was domineering and attacked the male protagonist Yu Silang.

In fact, at the end of the novel, the third branch of the Yu family did not receive any punishment, which can be regarded as a relatively good ending for the villain, which also led to protests from some readers.