In Li Xiuning and Li Feier's impression, salt seems to have no other use except cooking.

It’s strange that things that were originally impossible to happen actually changed, and some light yellow substances appeared in the pot. For the two girls who had no knowledge of chemistry, they appeared out of thin air, and there was mystery everywhere. For them, they were more interested in learning chemistry.

Looking at the surprised look of the two girls, Li Yu understood their mood very much and explained: "Xiu Ning, Fei'er, the alkali was added just now for saponification. When the oil was boiled in the alkali solution for a long time, it would reach a closed state. I now add salt to separate the soap particles and water. This step is called salting analysis."

Li Yu looked at the two girls' expressions that seemed to be unimaginable and said, "The more salt I add, the more soap particles there will be."

While saying that, he kept sprinkling salt into the pot. As Li Yu said, there were more and more light yellow soap particles, and later a thick layer floated on it.

After salting, the soap particles are in the upper layer and the lower layer is a mixture of glycerin and water, and the layering is very obvious. This situation is similar to the difference between tofu and water, so it is very simple to separate.

As long as there is a container to hold soap particles, Li Yu picked up the scoop and scooped the soap particles into a basin. After scoop the soap particles,

"Glycerin is the main by-product of soap. It has a wide range of uses. It can be used as medicine or as medicine. It has very good effect. Adding a few drops to fruit wine can remove the astringency."

"But it's more troublesome to get glycerin. It has to be filtered and distilled. If you smell a little smelly, store it in the jar first! Then use it later."

The two girls didn't understand either. They mainly looked at how the soap was made. They looked like they were magical, but they just felt very curious, and they ignored the others.

After scooping out the soap particles, there was still some turbid soap and the bottom alkaline waste liquid left in the pot. Li Yu skimmed out the middle layer of the turbid things and scooped them into another basin.

After the water boiled, Li Yu let it cook. After about half an hour, he scooped the soap into a clean basin and took the boiling water to pour it out.

Wash the pot, add water, add soap pellets, boil and heat. Cook for a while, separate the soap pellets from the water, and then add water to boil.

This is done to remove the remaining glycerin, hot alkali, pigment and soap glue. After boiling twice, the soap particles were already very even. Li Yu knew that the heat was up, so he sprinkled the rosin into the pot and stirred it evenly with a stick.

After heating it for a while, the rosin smell began to emit, and the fragrance scattered everywhere. When you smell it, you will be energetic. Li Feier took a few breaths: "It smells so fragrant! This rosin smells even more fragrant than before!"

Rosin was added to increase the aroma, otherwise how could it be called soap? There was no perfume in the Tang Dynasty, and there were no fragrances we use now. To increase the aroma, we can only choose the existing spices from the Tang Dynasty.

In fact, there are various fragrances in the space. Li Yu does not intend to use them for the time being, so that they can gradually adapt to it. When they see new things again in the future, they will not be surprised.

Li Yu scooped up the soap and poured it into the mold. He used a wooden board to smooth the soap in the mold, then put the lid on it, pressed it with his hands, and felt that it was not strong enough, so he divided a few stones and put them on it.

"Li Yu, that's all right?" Li Xiuning asked staring at the mold, and finally joked: "Making soap is like making tofu!"

"Well, it will be done when it solidifies and cools down. I guess it will take a long time to wait."

After Li Yu finished speaking, he asked again: "When it comes to tofu, do you know where there is brine?"

Li Xiuning responded and asked, "What do you want to do with brine?"

Li Yu explained again: "The brine and the waste in that basin can be made into wax after being fused. It has good quality and no smoke. It is better than paraffin and insect wax on the market, second only to the best butter wax."

"Dongxiang, you go back to the other courtyard to get some brine, hurry up." Li Xiuning didn't expect that the last waste could be made of wax, and hurriedly shouted to the maid outside.

In less than a quarter of an hour, several maids brought the brine. Li Yu added the mixed brine to it and placed it on the fire and stirred it vigorously.

Soon, the waste lard in the pot changed again and gradually solidified.

Li Xiuning and Li Feier squatted in front of the wax basin and looked at making wax. After looking at it for a while, Li Xiuning asked, "Is this how wax made?"

Li Yu was too lazy to explain, so he asked Li Feier to take a piece of cotton thread, use a bamboo tube to make a mold, and made a candle on the spot and lit it.

"Look at what? Is this candle lit up?" Li Yu asked holding the candle.

"It's really good. There's no smoke. I feel very good. Dongxiang, you all come and help. Make all these into candles. We will divide the two families in a while." Li Xiuning's eyebrows kept flashing.

"I did a good job this time. I actually knew that the two families of the made candles were divided. Why didn't the Japanese enter the village three-light policy?" Li Yu asked with a smile after hearing what Li Xiuning told the maid.

"What is the Japanese? What is the three-light policy for the Japanese to enter the village?" Li Xiuning raised her head and looked at Li Yu with confusion.

Li Yu could not explain the matter of the Japanese devils, so he did not answer, but instead shifted the topic.

"The soap was made so smooth today, and you two students made a great contribution. There will be nothing to do next. Moreover, the soap will have to wait until it cools down before it can be used. Now pack the tools and I will make a delicious meal for you two, so that you can guarantee that you have never seen new dishes." Li Yu's face was mysterious.

"This is almost the same, and I know how to make delicious food for me and Fei'er." Li Xiuning patted her limbs and said, "Oh! I'm so tired that I have to go to the house to rest for a while."

While talking, Li Xiuning raised her foot and was about to go upstairs.

When Li Yu saw Li Xiuning going to the house, he was afraid that she would see the furniture, so he hurriedly said, "Princess, if you are tired, please rest in Fei'er's room! It's not convenient for you to go to the house today."

"You, Li Yu, don't hide any treasures in the room, right? I have to go and see this. You didn't do anything wrong, what are you afraid of?" The more Li Yu stopped him, the more Li Xiuning wanted to go and see him. She murmured as she walked.

"I'm mainly afraid that you, the Somali pirate, will praise others when you see something good at your home. You just move it to your home, so I don't want you to see my baby, do you understand?" Li Yu saw that he couldn't stop it, so he had to explain helplessly.

After hearing this, Li Xiuning ignored Li Yu and went up the room directly, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, thump, th

Li Xiuning entered the room and suddenly stood there like a sculpture, with only her eyes moving, and she was very unladying in an instant, "Haha~~ Laughing: "My God! There are more furniture in this room overnight, and it seems to be more complete."

Li Feier ran into the house and saw the furniture that was pulled away by the princess yesterday. Now she is back. No, these furniture are not the ones that were pulled away, but she doesn't recognize some of the furniture. But how did these furniture be moved in made her look at her brother in confusion.

"Li Xiuning, let me tell you, if you dare to get my furniture away today, I dare to hit you in the butt, do you believe it?" Li Yu ignored Li Fei'er's doubts and warned Li Xiuning.

"I believe it! I just look at it. I have furniture now. I won't be pulling your furniture. Don't worry." Li Xiuning saw the dissatisfied expression on Li Yu's face, and quickly waved his hand and said.

"Hey! There are so many books in this bookcase!" Li Xiuning shouted in surprise when she saw the books in the bookcase.

"Three Character Classic", "Hundred Family Names", "View of Disciples", "Basics of Chemistry"... "Primary School Chinese Volume 1", "Primary School Mathematics Volume 2", "Chinese Dictionary", "Interpretation of Chinese Pinyin", "World Geography", "Chinese Geography", "Mystery of the Universe"...'Huh' novel "Swordsman Love", "Legend of Sword and Fairy II"...

"I haven't seen dozens of books in your bookcase before? The bookstore is still printed horizontally? It's so strange! There is also this ball ball, hey! How can I see the location of Chang'an at the top?" Li Xiuning was surprised to flip through the exquisite books in her hand, and then looked at the globe carefully and said to herself.

"I wrote these books for Fei'er. I asked her to learn from the future. Why do you have any objections?" Li Yu saw that Li Xiuning's robber's temperament was about to break out, so he refuted it with great politeness.

"Impossible! How could you write so many books? You will never finish these books in your life!" Li Xiuning looked at the contents of the book and raised her head with a look of doubt.

Li Yu did not explain, shook his shoulders and showed a look of pride on his face.

Li Xiuning picked up the second volume of the primary school Chinese textbook and flipped through several chapters, saying, "You see, it's impossible that you wrote these poems."

After saying that, Li Xiuning started to read it.

(It’s not easy for newcomers. Friends support me, please bookmark it and comment it. Of course, there is a red ticket.)
Chapter completed!