After the start of school, the days tended to be stable and calm.

After class in the afternoon of this day, Liu Bei first called his two followers Liu Xian and Liu Liang to go back, and asked them to inform their father Liu Hong, saying that they had gone to Zhang Fei's house and would come back later, and they didn't have to make dinner for themselves.

This made Liu Xian and Liu Liang quite envious, because they heard that Zhang Fei's family was very rich and ate meat at once.

After telling him, Liu Bei went with Zhang Fei, Liu Bei definitely didn't go to Zhang Fei's house for the so-called eating and drinking - this is just by the way, he has a more important purpose.

Zhang Hu expressed a certain welcome to Liu Bei's arrival, and then died down, looking lifeless, Zhang Fei persuaded Liu Bei for this, so that Liu Bei should not mind because of this, his father has always been like this since he can remember, not for anyone, Liu Bei expressed his understanding, some things he can feel, after all, under his young body hidden is an old soul in his thirties.

Although the ingredients of this meal are very rich, Liu Bei actually did not eat very much, first, the Han Dynasty's handling of ingredients is actually very simple, for example, the way of stir-frying did not appear, and there are many spices still in Southeast Asia and the Americas.

Second, Liu Bei has something on his mind, once a person has something on his mind, no matter what he does, he will always be indifferent, thus losing a lot of excitement.

Therefore, after this meal, Liu Bei said a salute to Zhang Hu and retreated, and after waiting for a while, Zhang Fei also came out of the main hall, Liu Bei began to urge: "Let's go, hurry up, which room are the things in?" ”

Zhang Fei frowned, and asked as he led the way, "Xuande, are you in such a hurry?" By the way, what do you want all those weird things for? ”

Liu Bei smiled: "Let me sell it first." ”

Zhang Fei couldn't say anything when he saw it, so he concentrated on leading the way, he was not the kind of person who stalked him.

The two came to a large wing room, which was used as a stack of sundries on weekdays, but a few days ago, many servants of the Zhang Mansion moved these old sundries under the command of Zhang Fei and put some new sundries.

Zhang Fei unlocked the lock, Liu Bei pushed the door, and there was a large iron pot at the door of the wing, and outside the iron pot, there were several wooden barrels and some messy burlap bags, and a few iron tools were placed flat between the wooden barrel and the burlap bag, so that the two were clearly distinguished.

Liu Bei saw these burlap bags, like a cat that saw a mouse, hurriedly rushed over, found some powder through the gap between the mouth of the burlap bags, took it to his eyes and took a closer look, couldn't hold back the ecstasy in his heart, and laughed: "Haha, yes, that's all, there are a lot of them." ”

Zhang Fei saw Liu Bei's crazy appearance, and became more and more confused, "Xuande, what are you doing?" ”

Liu Bei asked rhetorically: "Zhang Fei, do you know how your family's clothes are stained with oil on weekdays, and how to remove them?" ”

It is really rude to call him by his name, and Liu Bei doesn't want to do it, but what makes him depressed is that Zhang Fei doesn't have a nickname, and because of his age, he doesn't have a word, after all, not everyone is unreasonable and unreasonable like Liu Bei.

The name is just a code name, and the reverse meaning of this sentence is that people must have a code name for others to call themselves, helplessly, Liu Bei had no choice but to call Zhang Fei's name, fortunately, Zhang Fei didn't care about this matter, anyway, according to him, Zhang Hu, the old man Zhang, also called him by his name.

"What should I do if my clothes are dirty and oily? Naturally, I threw it away and replaced it with a new one. Zhang Fei is a matter of course.

Liu Bei had a black line, he almost forgot that this Zhang Fei's family was not bad for money, so he had to say: "I'm asking how to wash your servants' clothes when they are dirty?" ”

Zhang Fei shook his head directly: "This, but I don't know." ”

Sure enough, the young master of the wealthy family couldn't be expected to answer such a life-like question, thinking like this, Liu Bei had no choice but to say: "If I remember correctly, I washed and decontaminated with grass ash and mirage ash at that time." ”

Grass ash and mirage ash are the "laundry detergent" explored by the vast number of working people in this era by chance again and again.

Grass ash contains potassium carbonate, and mirage ash is the so-called shell ash, which contains sodium hydroxide, and the two are mixed together to produce potassium hydroxide, and potassium hydroxide reacts with the oil on the surface of the clothes in water to form "potassium soap", so as to achieve the effect of removing oil stains.

After hearing this, Zhang Fei nodded, still puzzled, and asked again: "Xuande, what do you want to do?" ”

Liu Bei was helpless in his heart, and there was really a generation gap, so he stopped selling Guanzi: "I found a recipe from ancient books, which can produce things that are more than ten times stronger than the decontamination effect of plant ash and mirage ash, and I ordered it to be named 'soap'." ”

After hearing this, Zhang Fei looked disapproving: "Oh, so that's the case, what's the use?" ”

What's the use, you can make money! Liu Bei couldn't complain about Zhang Fei, so he simply ignored him, turned around and got busy himself.

Liu Bei first took out a large wooden barrel filled with well water, then took out a handful of lime from a sack and sprinkled it in, then waited for the lime to react with the water, heat up, and mature lime, and grabbed a handful of lime and sprinkled it in.

The soaring water vapor suddenly enveloped the wing, and also frightened Zhang Fei, who was watching from the sidelines, Liu Bei smiled, this is the charm of chemistry, thanks to the nine-year compulsory education in the previous life.

After that, Liu Bei filtered out the impurities calcium carbonate, took out the pure sodium hydroxide from the wooden barrel and poured it into the large iron pot at the door, heated the iron pot, stirred it with the lard, and removed the grease through the saponification reaction.

Finally, some salt was added, and using the chemical principle of similar dissolving, Liu Bei successfully separated the soap stock solution from the water, and let it stand for a quarter of an hour, barely separated it with a small shovel, and made it into a piece.

Half an hour later, Liu Bei turned his head to Zhang Fei, who looked impatient, and said, "It's almost, Zhang Fei, you go and get me a burlap bag." ”

"Oh." Zhang Fei answered, brought the burlap bag, Liu Bei hurriedly put the soap into the cloth bag, due to the rush of time, these flakes of soap have not dried well, and they are a little sticky, but Liu Bei can't control it so much, fill the cloth bag, and point to the remaining soap in the pot and say: "Zhang Fei, you might as well use it, it's very useful." ”

After speaking, Liu Bei said goodbye and left, and when he returned home, it was Wang Wu who opened the door, he looked at Liu Bei, and said curiously: "What are you carrying behind you?" ”

Liu Bei ignored Wang Wu, he had important things to do now, and he had no leisure time to pay attention to these idle people.

When he came to the study, he found his father Liu Hong, Liu Bei first put down the sackcloth bag, then found a few dirty clothes and a wooden basin, soaked the dirty clothes in the wooden basin containing water, and carried them all the way back to the study.

Liu Hong saw Liu Bei go and return, and came to the study with a wooden basin in an undignified manner, and couldn't help frowning and asked, "Xuande, what are you doing here?" ”

Liu Bei first untied the sackcloth bag and took out a sheet of soap from it, and said while scrubbing his clothes: "Father, I recently found a recipe from ancient books, and the decontamination effect is extraordinary. ”

After listening to Liu Beizhi's words, Liu Hong's face suddenly became stiff, and he opened his mouth to reprimand Liu Bei.

But before the words came out, Liu Bei took the washed clothes to Liu Hong, Liu Hong subconsciously glanced at it, and saw that on the clothes, among the countless gray and black, a touch of snow white was dazzling.

"This—" Liu Hong exclaimed in surprise, stepped forward and grabbed both sides of the dirty clothes, and looked at the snow-white color carefully, completely ignoring the "ticking" sound of water droplets falling from his clothes and hitting the ground.

"Why is that?" Liu Hong turned his head to look at Liu Bei, the place where the clothes had been scrubbed was like new, Liu Hong knew what it meant, this is the rolling five baht coin, and Liu Hong, who had a difficult time with his father's early death, knew very well the loveliness of the five baht coin.

"Father, I don't know how it works, I just stumbled upon it."

"What's the name of this thing?" Liu Hong asked, pointing to the soap scattered on the ground.

"The child called it 'soap.'"

"Soap? Okay, okay," Liu Hong applauded again and again, completely ignoring his demeanor.

"That's right." Liu Hong seemed to suddenly remember something, and hurriedly asked, "Is there anyone else who knows about this thing?" ”

"This-" Liu Bei hesitated: "Because the materials are hard to find, the child completed this thing together with his classmate Zhang Fei." ”

"Where?"

"At his house."

"Confused!" Liu Hong couldn't help but say, this eldest son, who was extremely pleasing to the eye just now, looked like a fool at this time, but when he thought of Liu Bei's age, he had to sigh: "That's it, that's it, Xuande, tell me, where is your fellow scholar named Zhang Fei?" Who is his father? ”

Liu Bei replied: "Zhang Fei's house is in the west of the city, and there is a peach garden behind the house, and Uncle Zhang should be famous." ”

"Zhang Hu, it turned out to be him." Liu Hong couldn't help but say.

"Father, do you still know each other?" Liu Bei pretended to be curious and asked.

"Hey!" Liu Hong sighed and said: "I know each other, just don't think too much, tomorrow I will go to my senior brother to take a leave of absence for you, you won't go to the county school first, follow me to Zhang's house to visit." ”

"Okay, Xuande, you can go back to the house first, read a book, and rest early."

……

Liu Bei retreated, returned to the room, picked up "Nine Chapters of Arithmetic" and read it, his eyes were on the book, but his heart was floating in the sky.

In fact, Liu Bei didn't let Zhang Fei participate in the manufacture of soap at the beginning, but the reality is always so helpless, he ran all over the large and small shops in Zhuo County, but he didn't find several raw materials for making soap, take soda ash as an example, because the steamed bun has not yet been invented, this thing is now a waste, and it can't be sold at all.

So, in the case of marrying for a long time and not making progress, Liu Bei had no choice but to ask the wealthy Zhang Fei to help, which inevitably involved Zhang Fei in the manufacture of soap; As for telling his father Liu Hong, Liu Bei has no idea at all, and his old man will never support him, and maybe he will scold himself and give him a "good name" for not doing his job. ”

This is the case with the national conditions of this era.

"Actually, I can ...... first" Liu Bei suddenly thought of it, but as soon as his thoughts turned, he shook his head again, "What's the benefit of thinking about this now?" Why did you go earlier, I hope you can all be happy tomorrow. ”

It's always the case that people are always like this, and it's ironic to find that they actually seem to have a better choice.