Chapter 116 Why Iron Rusts
“This business is booming!”
Even Gu Feixue, who had experienced the impact of the modern Double Eleven, couldn't help but be amazed after seeing it.
Seeing that Chunyue was so busy that she looked exhausted, Gu Feixue could only give her a gesture.
Chunyue breathed a sigh of relief upon seeing this.
"It's too late today. Please come back tomorrow so your makeup will last longer in front of others."
Although those who bought a lot of rouge and waited for a long time for their turn were unwilling to give up, when they thought about the dark night, even if they did their styling, who would they show it to?
So these women left their credentials and waited to come back tomorrow to get their hair done.
After Jinxiu closed the store, everyone finally breathed a sigh of relief.
After Gu Feixue took stock of the shop's revenue today, she came up with a shocking figure.
"Sure! Today's net profit is 55 taels of silver!"
This is the income after deducting the cost. It can be said that the sales of rouge also boosted the sales of down jackets in the shop. The two complement each other. The money earned in one day is almost as much as that earned by Zuixianlou!
Chunyue was obviously very happy too, but she shook her numb hands and seemed to want to say something.
"Okay, Chunyue, don't worry. I'll find you a few apprentices right away. From now on, you can just style those with the highest points."
Jinxiu also has a grading system for its customers. Points are accumulated based on the total price of goods purchased in the shop. Those with higher points will naturally be received by the more professional Chunyue.
The rest will be left to Chunyue's apprentices, so that she won't be tired.
After returning to Anju Village, Gu Feixue first took a walk around the farm. When everything was fine, she returned to the Gu family.
The twenty boxes of rouge prepared today, each box costing seven taels of silver, were all sold out.
She spent five taels of silver to purchase these rouges, and made a net profit of forty taels from the rouge alone.
Of course, this is inseparable from the efforts of Chunyue and others. This month she gave them a big red envelope as a reward.
"Brother, help me move something."
After dinner, Gu Feixue called Gu Tingchuan, who had been studying hard all day, to do hard labor.
In fact, dozens of boxes of rouge are not heavy at all. It’s just that Gu Feixue wanted Gu Tingchuan to combine work and rest and relax.
"What is this?"
Gu Tingchuan moved the box of rouge to Gu Feixue's studio and found that the things inside were very novel.
"These are used to purify rouge, and of course they can be used for experiments."
"Experiment?" Gu Tingchuan was an ancient man and obviously didn't understand what an experiment was.
Gu Feixue thought for a while and said:
"It's used to study the properties of things, like why iron turns to rust, or why clay can be fired into pottery."
For an ancient person, it was difficult to understand what physical changes were and what chemical changes were. Gu Feixue could only explain it this way.
"Why does iron turn to rust?"
Gu Tingchuan pondered for a moment:
"This is because the ironware was placed near water."
Gu Feixue's eyes lit up: "That's right, but that's not entirely true. Iron won't necessarily rust just by coming into contact with water. To rust, other things are needed."
Gu Tingchuan was stunned when he heard this: "What else do you need?"
Gu Feixue smiled and said mysteriously, "It also needs air. Iron won't rust even if it comes into contact with water in an airless environment."
Air? Isn't that everywhere?
"Okay, whatever Xue'er says is what it is."
Gu Feixue was somewhat helpless and could only let Gu Tingchuan rub her hair and then went to the study to review.
Sitting in her chair, Gu Feixue was refining the rouge while thinking about another thing.
That is Gu Tingchuan's academic performance. Of course, even a modern person like her cannot catch up with Gu Tingchuan in terms of studying.
She once read the eight-part essay that Gu Tingchuan had learned, and was confused and didn't understand what he was saying.
But apart from studying, she also has areas where she can help.
For example, eating.
During this year, every time Gu Tingchuan came out of the examination room, his face was pale and his legs were weak.
It wasn't just Gu Tingchuan. The situation for other candidates was even worse. Some candidates fainted directly in the examination room, and it was not uncommon for them to be carried out halfway.
Mainly because the exams lasted two or three days, some people pushed through, starving to the point of rolling their eyes. Some ate cold food and ended up with diarrhea, forcing them to leave the exam room because they weren't allowed to leave their seats to use the restroom.
So Gu Feixue had been thinking from the beginning about how to make sure Gu Tingchuan could eat and drink well in the examination room, so that he could have hot meals and not perform poorly due to hunger.
Although she made some easy-to-store bread, even instant noodles and dehydrated vegetables baked in the oven for the prefectural examination after the county examination, the water provided in the examination room was not hot at all, causing Gu Tingchuan to have to eat dry bread to get through the examination.
She hadn't been able to get hot water in before, but now she has these experimental equipment babies, the situation is different.
For example, modern self-heating devices, such as the self-heating bags in self-heating rice and self-heating hot pot, are typical chemical exothermic reactions.
In other words, the iron rusting reaction that she and Gu Tingchuan mentioned just now, some modern hot packs and self-heating bags use the oxidation heat of iron powder.
Of course, there are other chemical reactions that release a lot of heat energy, so Gu Feixue still plans to start the experiment with the iron powder self-heating bag.
When thinking of iron, Gu Feixue thought of the huge iron mine in Ruyi Mountain. If it could be mined...
"Wake up!"
After knocking her head, Gu Feixue focused her attention back on purifying the rouge.
Half an hour later, Gu Feixue finished purifying the rouge to be sold tomorrow and began to prepare the production of iron powder self-heating bags.
However, after three days of experiments, Gu Feixue still found that it was too difficult to produce loyal fans in this era.
In particular, iron powder will react almost immediately when it comes into contact with oxygen. Although we have plastic bags that can isolate oxygen nowadays, we do not have such raw materials.
Oxygen is everywhere. Even if iron powder can be made, it will react very quickly with the oxygen in the air, so the feasibility is too low.
So she had to look for other exothermic chemical reactions.
After much deliberation, Gu Feixue finally chose the exothermic chemical reaction of calcium oxide and water.
Water is more controllable than oxygen, and water will be provided in the examination room.
Calcium oxide, commonly known as quicklime, can release a lot of heat when it reacts with water. Some self-heating bags take advantage of this. By adding cold water to the bottom, you can cook rice or hot pot.
The production of quicklime is very simple. Limestone, which is a rock near the shallow sea, is calcined at high temperature to produce quicklime and carbon dioxide.
Although Liangcheng does not have a shallow sea, it has caves and stone forests with similar environments, and these places have limestone.
Gu Feixue had actually seen a cave of this kind in Ruyi Mountain.
However, in order to find ginseng at that time, she just glanced at the cave entrance and walked away. After all, there was no ginseng in the cave.
In this way, Ruyi Mountain is indeed rich in mineral resources.
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