When Li Yi was making soap, during the saponification reaction, there were layers of salt, glycerin, etc. in the chemical reaction process.

There is a liquid of unsaturated saponification reaction in it, and the salt and glycerin are extracted separately, and the rest is soapy water.

These soapy water are generally used to participate in the next saponification reaction, and if you want to purify, you can still produce some soap, but the input is not proportional to the output.

Now it's just taking it out and selling it, and Li Yi of the entire Tang Dynasty can't take care of it, and Chang'an County is still fine.

More than a million people, not all of them use soapy water, and soap powder, and the poor people scrub with plant ashes.

That is, now the people of Datang do not take a bath for a long time, especially in winter, only officials have a day to rest.

If you want to say who always takes a bath, the girls of Pingkangfang, it is not uncommon for Beiqu to wash eight times a day.

In addition, there are the villagers who do hard work and special workshops in the Zhuangzi, and they cut their hair, short hair, and even Mao Cun for men.

When you go to the bath, you can wash hard, which is convenient and comfortable.

Li Yiruo is not to take care of face, he can't shave a bald head, it's convenient to operate on a bald head, wash it, wash it and put on a surgical cap, don't worry about something falling into the patient's wound.

"It's hard to find oil, especially the pancreas, and everyone else takes it to wash with the ashes." Li Chengqi knew that Li Yi had used a lot of fat before.

"I use soybean oil now." Li Yi whispered, who stipulated that the saponification reaction must be animal fat?

"Soybean oil is fine?" Li Chengqi was surprised, he had never learned to make soap with soybean oil since he was a child, how many magical things are there?

Oil and soap, two things are much different, right?

"It's like making soy milk into tofu." Li Yi understood the eldest brother's mind and explained it with the simplest example.

"Yes, soy milk can be made into tofu, and it can also be made into dried tofu, and soap is also put gypsum, brine or vinegar into soybean oil?" Li Chengqi began to imagine.

"If you put vinegar, the cooked oil can be used to mix vegetables." Li Yi joked.

After speaking, Li Yi asked the child who came over with his stomach covered: "Where are you uncomfortable?" ”

"Belly, belly." The child said.

"It's bugs, right? Brother Yi, you give him that candy. Li Chengqi felt that he could also be a doctor.

Li Yi asked Qingsong to lay the box flat, and the child put it on it and began to touch it.

"Does it hurt here?" Li Yi asked.

"It hurts a little when you press it, and it doesn't hurt if you don't press it." The child replied.

"Why does it hurt, is it like a pinprick?" Li Yi asked again.

"It's like it hurts, it hurts everywhere."

"What about here?"

"It doesn't hurt, it's not okay, I'm going to spit up." The child said and struggled, wow! Spit out.

"Can I throw up again?" Li Yi looked at the 'water' that came out of the vomit and asked.

"I can't throw it up." The child replied.

"Give him two skewers to eat, hungry." Li Yi commanded.

Then ask the child, "Didn't eat last night?" ”

"How do you know?" The child said I was surprised.

"Not only did I not eat, but I didn't drink a few sips of water, but I got up in the morning and went directly to Zhuangzi and drank a few mouthfuls of soup.

The metabolism is too fast, and the water quickly enters the kidneys and bladder.

The remaining little meat foam, the stomach gives a feedback, the gastric acid secretion increases, and the result is that the spit out is foamy.

It's a bit bitter, isn't it? The bile is secreted, there is bile in it, and the stomach acid irritates the gastric mucosa, and of course you have a stomachache. ”

Li Yi gave a scientific explanation, what bugs? It's hungry.

The farmer next to him gave a few skewers, and the child ate them deliciously.

"Does it still hurt?" Li Yi asked again at this time.

"It doesn't hurt, it's hot." The child is honest.

Li Chengqi was stunned beside him, he didn't feel hungry and uncomfortable, he was shocked by Li Yi's diagnosis.

Press a button, the child spit out, and he knows that he is hungry, and he can even tell that he didn't eat last night?

"Who else is hungry and comes to eat, eat less, there is dinner at noon, can my Li family Zhuangzi send the dolls a mouthful of food?"

Li Yi shouted at the other children.

Sure enough, many children came back and wanted to eat.

"Why don't you eat?" Li Chengqi wanted to learn, but he didn't become a miracle doctor just now.

"It's to drink soup, it's okay if you don't drink soup, there is oil and water in the soup, and the stomach naturally reacts to absorb it. Otherwise, you will be too hungry, and your stomach will find that it is empty, and you will slow down the secretion of gastric acid, and you will not feel hungry. ”

Li Yi explained the reason that hunger is the feedback of gastric acid stimulating the gastric mucosa.

Drinking a lot of water and feeling not hungry for a while is because the water dilutes the stomach acid.

Li Chengqi: "......"

He felt that he was not suitable for studying medicine, at least not for studying medicine with Brother Yi, it was too difficult, what kind of mess?

"And now?" He asked.

"Now eat a few skewers, comprehensive stomach acid, and then stomach acid secretion is more, and you can eat a lot of meals by noon, which is not less than ordinary adults."

Li Yi also went to scoop a spoonful of soup as he spoke, and drank it, it was cold outside.

"That's right, half the size, eat the poor old man." Li Chengqi came to a common saying.

"Proprietor Li, don't we eat without money?" A man from a rich and noble family came over and said to Li Yi.

"Are you excused?" Li Chengqi slammed back.

After saying this, Li Chengqi left in a hurry, the game over there should be over, right? It's time for the next one, and then eat.

Li Yi also did not answer such boring questions, and continued to look at the child's physical condition.

When I look at it, it is a learning process, and sometimes I take the pulse and compare it.

At noon, the children of the rich and noble families went to Zhangjia Village, and the children who came by themselves were arranged in the corner of the canteen, and each person had a mushu meat rice bowl and radish shredded soup.

The children laughed, they thought there was only one bowl of noodles, and it would be nice to have a bowl of noodles.

As a result, there was meat, eggs, fungus and cucumber slices, and the shredded radish soup was also delicious.

So they decided to come back tomorrow and call the other friends.

"Proprietor, they're coming tomorrow." Ziyu said things that were in line with human nature.

"Tomorrow give them back to the pot meat, make it with garlic sprouts, no chili peppers, and I don't have chili peppers for others to eat."

Li Yi agreed with Ziyu's words and said tomorrow's eating arrangements.

"Proprietors, I mean they're greedy." Ziyu regarded herself as a member of the Zhuangzi, and felt distressed for giving things to others.

"I didn't dare to give fat meat today, because I was afraid that they would not eat oil for a long time, and the gastrointestinal tract would not adapt, and the mushu meat would be just adjusted, and tomorrow I would eat fat and thin back to the pot, plus garlic sprouts to stimulate the gastrointestinal tract, and eat braised pork rice bowl the day after tomorrow."

Li Yi didn't seem to understand, or didn't hear what Ziyu said, and continued to talk about himself.

"The proprietor, I'm done eating, I'll take over the baby." Cuiliu put down her chopsticks at this time and said to go out.

"I've eaten too." Brown Rock pulled the last bite of food into his mouth, and said in a muffled voice, he hadn't swallowed it yet.

"I'll tell them later, proprietor." Qingsong took the initiative to take up the heavy responsibility and wanted to tell the four people about the situation of Zhuangzi.

"Selling newspapers requires manpower, and if you don't take care of your body, how can you go to various places to deliver newspapers." Li Yi said something that the four newcomers didn't understand.

His movable type has been produced, copper movable type.

Lead type is not easy to take care of in winter, easy to poison, so I didn't touch it, and when the weather is warm, there are more protective measures, and then change.

Each movable type is money, made of melted copper coins and ordinary bronze utensils.