"Sit down." He put down the book in one fell swoop, stroked the beard on his chin, looked at Su Yan and smiled. This Xiao Su Yan is not called Mr. or Master as well as before, he has to be called a "teacher", saying that since he is his student, he must be distinguished from others. Hey, but this teacher is calling for a lot of ironing.

Su Yan sat down, flipped out the pages he had copied out of the book, carefully spread them on the table, stretched out his hand and gently smoothed the creases, and then got up and handed the paper to He Yiju with both hands. Her eyes were expectant, and if there was a tail behind her, it must have waged up.

He glanced at the paper she handed over, did not hide his satisfaction, smiled slightly, and the slight wrinkles in his eyes squeezed together.

"Yes, the handwriting is quite neat."

Hearing this, Su Yan smiled and narrowed his eyes.

"Teacher He, I know all these books, let's talk about something else today."

"Oh? Will the paraphrasing too? Tell me about it, I'll hear it. He stood up in one fell swoop and walked to Su Yan's table, "Cover this body, four big and five constant." If you bow down and raise you, how dare you destroy it. ”

"This sentence is about the human body, hair and skin, is composed of the four substances of earth, water, fire and wind, human thinking and personality, by benevolence, righteousness, propriety, wisdom and faith as the standard, only careful care, how can it be easily destroyed and damaged." Su Yan paused, touched his head and said, "What, in our place, it is required to be neat and easy to do, so men all have short hair." ”

He glanced lightly at her hair, turned his back, and didn't say anything, just nodded. Su Yan sighed, Mr. He is a strict person, and has said many times openly and secretly about her hair, so what, her hair has already grown, but she doesn't dare to cut it again.

Mr. He tested her a few more words, and Su Yan answered them all one by one.

Mr. He said: "It's all still being handled, but some of them haven't been fully understood yet, and they need to be studied in depth." ”

Speaking of this, seeing that Su Yan was visibly about to languish with the naked eye, he continued, "Learning is all the same, draw inferences from one another, and touch the analogy." Learning is for the sake of being a human being and being reasonable. Today we will talk about these four books. ”

Su Yan was happy again.

Today is the first day of formal study, and I have been talking for most of the hour. It is estimated that it was six or seven o'clock in the evening that Mr. He let Su Yan go to dinner.

Su Yan finished eating, cleaned up briefly, and then took things to the kitchen.

Aunt He is scrubbing the pot stove and preparing the next day's meal. Seeing Su Yan come in, he took the dishes in his hand and washed them, and pointed out the processed scraps and fat to her: "Little brother Su Yan, it's all taken care of, see if it's okay." ”

Su Yan thanked him, and when he saw that everything was clean, he laid out everything one by one and prepared to make a soap base. When she came to the kitchen earlier, she soaked the ashes of the plants, and now the water has cleared. She took a funnel, took charcoal and clean sand, wrapped it in gauze, and made a simple strainer to slowly strain the ash water from the grass and trees.

At this time, he took the newly bought pot, put it on the stove, and poured the cleaned scraps and fat into it to boil the fat.

Su Yan had only done it in the laboratory before, using ready-made caustic soda and oil, this condition was the first time, Su Yan was not sure whether he could succeed, and he did not buy more materials, so it took only three or four teas to prepare semi-finished products. Just as she was about to start drinking, she remembered Yun Yan's instructions, and asked Aunt He to help call Yun Yan, which happened to be a lot of effort.

It didn't take long for Yun Yan to come over, and before he entered the door, he heard his excited voice: "Su Yan, are you going to eat!" ”

Su Yan laughed loudly: "I called you here, but I didn't want to eat and drink." ”

Yun Yan was wearing a narrow-sleeved shirt with a round neck at this time, he lifted the hem of his clothes, and stepped into the kitchen: "I smell the smell of meat, isn't this boiled for wine?" ”

"If you don't want meat, you want oil and a pot." Su Yan rolled up his sleeves and looked at him with a malicious smile, "You asked me to open the wine and call you, I called, you can open it." Then he patted the wine jar under his hand and motioned for him to open the wine.

Yun Yan took it when he heard this, patted the wine seal, and said: "Well, this jar is not a good wine, and it is far worse than the wine being brewed in Chu Temple, but I don't pick it either, hahahaha." ”

Su Yan raised his eyebrows: "Have you ever drunk the wine brewed by Brother Yunqing?" ”

"That's natural, Chu Temple is out of wine and will send a few jars to the prince, and we also have a mouthful." Yun Yan pushed the wine jar over to her, smacking her lips, as if she had an aftertaste.

Su Yan held up the wine jar and smelled it, this jar is grain fermented wine, and Su Yan can't smell any specific grain, it has not been distilled, and the purity is very low. The purpose of adding wine is to dissolve the oil and speed up the saponification reaction, but she can't be sure if this wine will work, and there is no sealing tool for distillation in her hand now, so Su Yan thought about preparing the experiment in two parts, one with wine and one without wine.

"When I'm free, I'll fill you up." Su Yan put down the wine jar, glanced at him, and said with a smile. Inspired by Yun Yan, she plans to wait for the soap to be made before trying to roast or distill liquor.

Yun Yan's eyes lit up, and he said in surprise: "You can also make wine?" ”

"No, it won't." Su Yan said calmly, she scooped the oil residue into the bucket, poured half a pot of water, put two wooden strips in the pot, put a copper basin on it, poured half of the oil into the basin, waited until the oil temperature was slightly hot, estimated the proportion, poured a part of the clarified grass and wood gray water, and instructed Yun Yan: "You come and stir, don't stop." ”

At this time, Aunt He had already left, so Su Yan tied the hem of her clothes into her belt and sat down on the stove to add fire.

The temperature of soap should not be too high, otherwise it will be stratified during the saponification reaction, and even hollow after soap is produced, and it cannot be solidified, so it is necessary to control the heat while heating with water.

Su Yan spent winter and summer vacations in the countryside when she was a child, and began to secretly burn sweet potatoes and roast sparrows in the stove nest when she was a child.

"What are you doing?" Yun Yan stretched out her nose to smell while stirring, and it was a smell of meat and oil.

"This is called soap, and the effect is similar to that of soap beans."

"Can this take a shower and wash clothes?" Yun Yan frowned, looking at the things under his hands with a look of disgust and suspicion. The grease in the basin and the ash water of the plants and trees are mixed together, and as you stir, it becomes thicker and thicker.

Liar the ghost, isn't it eaten, why did it become a bath bean again, with this ~ so much oil, it won't get dirtier and dirtier the more you wash it?

"That's it, it's much cleaner than soap." When Su Yan saw his expression, he knew that he didn't believe it, and he didn't explain much, hmph, there was always a time when he slapped his face.

After stirring for more than an hour, Su Yan stopped, and Yun Yan felt that his hands were not his own. Why did he come over, he regretted it, he regretted it very much.

Su Yan poured the reacted soap clay into a wooden mold, covered it with a wooden board, and placed it next to the stove to keep warm, and then had to dry it for two or three weeks before seeing the final product.