Chen Wanrong understood their mood and explained to them: "Dad, mother, the oil contains colloids such as phospholipids. If it is added to water, it will settle down. After eating, it will be filtered with a cloth and then it will be clear again."

When making soap with lard, the first step is not a saponification reaction, but pretreatment. You need to remove the impurities such as colloids and pigments in the oil. There are many methods, including hydration, alkali refining, and acid refining. The acid refining method requires sulfuric acid. Chen Wanrong does not have sulfuric acid, so he can only use the simplest hydration method.

The hydration method of refined oil is not bad, but it is more convenient.

This is professional knowledge of chemistry. Chen Laoshi and his wife didn't understand it. It was so foggy that Chen Wang nodded slightly, but Chen Laoshi kept praising him: "What a good idea! A good idea!"

In the minds of the Tang people, lard is used for eating, and no one will be used as soap like Chen Wanrong. Not to mention Chen Laoshi, a poor family, how precious oil is, and even if you kill him, you will not add water to the oil. Naturally, you will not be able to see such wonderful changes.

"Wanrong, why do you need to add alkali instead of just water in that bucket?" Chen Wang was more thoughtful and found that the two buckets of songs were different.

After she reminded her, Chen Laoshi also understood and touched his forehead and said, "Yes, Wanrong, why is this?"

One bucket is refined, and the other bucket is not refined, and the treatment method is also different. The oil will undergo a saponification reaction when encountering alkali. A lot of flocs have appeared in the bucket, floating in the water. Chen Wanrong pointed to these flocs and explained: "Dad, mother, look. These flocs are not useless, but very useful. Through these flocs, you can absorb the pigments and impurities in the oil, thereby achieving the purpose of removing impurities."

If the lard is not pretreated and saponified directly, impurities will be brought in. The alkali refining method is used, and trace amounts of alkali are added to make it saponification reaction to form floc-like bases. The pigments and impurities in the oil can be removed. This method is both convenient and easy to use.

Unfortunately, even such a simple method, Chen Laoshi and his wife were like listening to the heavenly books, and they couldn't understand it at all. Chen Laoshi touched his forehead and was confused. Chen Wangshi was much smarter. He knew that this was not something he could understand, so he simply refused to explore it and said, "Wanrong, let's have dinner first."

After dinner, there was something serious to do, and Chen Wanrong had no objection, so the three of them gathered around the table to have a meal.

Chen and his wife have seen the fact that they made soap with leather wastewater. They have never seen the fact that they made soap with lard. They are very curious and their meals are much faster. After a while, the couple put down the bowl. As soon as Chen and his bowl were put, they slipped to the side of the bucket and looked at it.

Chen Wanrong helped Chen Wang clean up the pot and bowl, and then cut the linen cloth he bought yesterday with scissors and spread three layers in the hand sieve for filtering wastewater. Then he put a clean wooden barrel next to the oil barrel, put two wooden boards on it, and then put the hand sieve on it. He used a ladle to lift the oil and water into the hand sieve. A rustling sound of water sounded, and the oil and water flowed into the barrel.

This filtration speed is very fast. In the blink of an eye, all the oil and water flow into the bucket. I saw a layer of impurities on the linen and some tiny oil residues that turned white after soaking in water.

Looking at these impurities, Chen Laoshi and his wife were surprised. They never thought that there were so many impurities in the lard for people to eat. Chen Laoshi said in horror: "Is the oil so dirty? What else can I eat in the future?"

There was no feed in the Tang Dynasty, and pigs were fed with grain. They were definitely called environmentally friendly food. They were safer and there was no way to eat them. These impurities were produced by chemical reactions. Chen Wanrong comforted him and said, "Dad, don't think so much. These things are two different things. These things are harmful to use for soap, but they are fine."

Chen Wang was originally as surprised as Chen Laoshi. After hearing Chen Wanrong's words, he felt relieved. He touched Chen Laoshi and said, "Old man, don't think about it."

Chen Wanrong kept scooping up the oil and water and pouring it into his hand sieve. After a while, the filtering was done. The impurities on the linen were as thick as those of a little finger. The oil and water in the bucket were as clear as before, and the original turbidity disappeared.

The next thing is similar to using wastewater to make soap. Put the oil and water in a pot and heat it up. Adding the hot alkali solution to make it saponified. Cooking until it closes is a long process. Taking advantage of this, Chen Wanrong went to prepare the hot alkali solution again. Chen Wangshi came over to take action, and Chen Wang was responsible for raising the heat.

It was almost done, and Chen Wanrong added salt and salted out. After the salt was broken, the soap base and water were separated. After the separation was completed, Chen Wanrong and Chen honestly carried the bucket to pour out the wastewater. The wastewater was rich in glycerin. If the conditions were available, extract the glycerin and then they would find the treasure again. However, if there were no such conditions, Chen Wanrong could only bear the pain and give up.

After washing with water, alkaline washing, and adding rosin to adjust the fragrance, the first pot is ready. The next step is to press and mold.

Chen Wanrong was about to find a mold, but Chen Laoshi had already come out with the mold, shook the lid in his hand, and said, "Wanrong, look, Dad has finished the characters for you, do you think it's suitable or not."

Chen Wanrong took the lid and saw that there were some small wooden strips sticking to the lid, which were even smaller than the chopsticks. These wooden strips were spelled into the six characters "Chen's Chemical Soap" and divided into two lines, with the four characters "Chen's Chemical" on the top and the two characters "Soap" on the bottom.

The words are well pieced together, far worse than the calligrapher, but they are much better than the words written with a chisel. Chen Wanrong was very satisfied and said, "Thank you dad!"

Chen spoke honestly and sometimes did not give people face, but he devoted himself to himself and thought of everything. Chen Wanrong was very happy.

Chen Laoshi was very helpful and said with a glitter on his face: "Thank you so much. Dad, you think it's too hard to write with a chisel, so he made a spell for you. You can see it's easy to use." There was no shortage of gratitude.

Put the soap into the mold and shovel it flat, close the lid, move it to the table in the house, and then put a few stones on the lid to press it. This pot was truly completed, but it took a lot of time and it was almost noon.

After resting for a while, I made the second pot. After finishing the third pot, it was already sunset and not far from dark.

After a day of hard work, I was really tired. Not only Chen Wanrong was so tired, but Chen and Hushen were so tired. But when they looked at the neatly arranged soap on the table, Chen and Hushen and Hushen were so happy that they couldn't close their mouths: Although they were tired today, they lived a fulfilling life. What's even more rare is that they were full of hope for the future!

Chen Wanrong sat on the stool, panting with his back against the wall, and did a few chest expansion movements, which was so comfortable.

"How much does it cost?" Chen Laoshi picked up a piece of soap and looked at it carefully, feeling happy.

"Dad, I'm back!" A loud voice came from outside the house.

This voice is very familiar to Chen Wanrong and Chen Laoshi couple. It is Chen Zairong's voice. Chen Laoshi said happily: "Zairong!" He turned his head and saw Chen Zairong's figure appearing at the door. Behind him were two middle-aged people, with extraordinary temperament. The bookish spirit on the left was a scholar who was well-educated. The eyes on the right were bright and clear, and when they were turning, they were energetic. What was even more rare was a righteous spirit. Just take a look and you would know that this person was upright and selfless.

"Zairong, what are you doing when you are back? Today is not a day of rest, so you won't stop studying again?" Chen Wang stared at Chen Zairong nervously. Chen Zairong wanted to drop out of school several times, but I don't know how many times you went home midway. When she saw Chen Zairong's face, she had to think about this.

Chen Zairong came in relaxedly, hugged Chen Wang's neck, stuck out his tongue and licked Chen Wang's face, and said, "Mom, don't worry, why would I not study? I brought Mr. Huang and Mr. Wu to our house, and they came to visit my brother in a special way."

Mr. Huang and Mr. Wu? Are they the Mr. Huang from the county hall and Wu Jing from the couple? What are they asking me for? Chen Wanrong never thought that Wu and Huang would come to visit him. If he had glasses, his ears would be full of cracking lenses.
Chapter completed!