When she heard that Brother Zhou Chong finally remembered to help him prepare a return gift, she was also very happy and said: "Great, I have been thinking about how to return the gift to Sister Lingyun in the past two days, I thought that brother, you forgot about it, but I didn't expect you to remember it." ”

Seeing Bang'er's happy appearance, Zhou Zhong pinched Bang'er's small nose dotingly and said, "How could my brother forget to promise Bang'er?" I'm going to buy all the ingredients this afternoon, and I should be able to make them in no time, and the process of making this gift is so much fun that you can watch it with Doll then! ”

Duo'er saw her brother and sister talking, so she leaned on the table to play with Zhou Zhong's pen and ink, but when she heard her brother mention her name, and then heard the word "gift", she immediately reflexively said: "I know that my brother hid my sister's gift in the bed!" ”

"Poof~" Zhou Zhong almost spurted out a mouthful of old blood, thinking that children are just unreliable, how much effort is this, so she left the previous agreement behind.

"Gift, what gift, brother, what are you hiding in the bed?" Bang'er was also very strange when she heard Duo'er's words, and walked to the side of the bed to pull the messy quilt around her.

Seeing that Jin Zhumei's manuscript was about to be discovered, Zhou Chongyi flew to the bed, then turned his head and smiled at the bracelet: "There are no gifts, don't listen to Duo'er's nonsense!" When Zhou Zhong said this, he turned his head and glared at Duo'er, who also realized his mistake at this time, so he spit out his cute little tongue and ran out of the room to play with the white ball with a smile.

Seeing Zhou Chong's performance, he aroused the curiosity of the bracelet even more, and stepped forward to tear the quilt with Zhou Chong, wanting to see what was hidden under the quilt. Zhou Zhong naturally couldn't let her succeed, so he pressed the quilt with his body, and the two refused to give in to each other, and they stalemate for a while.

After all, Bang'er was only a fourteen-year-old girl, and she was soon tired and panting, and the strength in her hand was loosened, taking advantage of this opportunity, Zhou Chongyi grabbed Bang'er's little hand, and then she said as she walked out: "Auntie's side should have made lunch, let's go eat!" ”

Although Bang'er's face was full of reluctance, he really didn't have the strength to struggle at this time, so he had to pout and be pulled out of the yard by Zhou Chong, and Zhou Chong locked the yard for the first time in order to dispel Bang'er's intention to return secretly, which made Bang'er even more unhappy.

After lunch, Zhou Chong and Steward Xu pushed the cart out of the door, originally to buy some flour only need one person to go, but Zhou Chong did not know the location of the grain and oil store, although Steward Xu knew the Dao, but he was old, plus Wu Shan was bedridden to recuperate, he couldn't help Steward Xu, and Zhou Chong also had to prepare materials for gifts, and one person was afraid that he couldn't take it, so the two of them went out together.

Soon Zhou Zhong followed Steward Xu to the grain and oil store and bought half a bag of flour, just this flour, it used nearly two cents of silver, if it was exchanged for the same weight of rice, it was estimated that it would only cost one-third of the money, so we can see how expensive flour is in the south.

In addition to flour, Zhou Zhong also bought a large jar of oil, the oil in the grain and oil store is divided into many kinds, there are animal oil and vegetable oil, among which Zhou Zhong bought the most common and cheapest rapeseed oil in the Yangtze River Basin, more than 50 catties, which makes Steward Xu complain, one is that there is some oil at home, and secondly, he also thinks that Zhou Chong buys too much oil, and I am afraid that the family will not be able to eat so much oil for a while. However, Zhou Zhong smiled and did not explain, he didn't buy these oils for food.

After buying flour and vegetable oil, Zhou Zhong was a little surprised to find that the grain and oil store also sold alkaline noodles, that is, sodium carbonate. In fact, it is not surprising to think about it, when making pasta, alkaline noodles are used in the first place, so it is normal for grain and oil stores to sell alkaline noodles at the same time. It just so happened that Zhou Zhong was looking for it again, but unfortunately the alkaline noodles were not used much when making pasta, so the grain and oil stores did not buy too many goods, and a total of more than 20 catties of alkaline noodles were all packed and taken away by Zhou Chong.

After putting all the things he bought in the car, Zhou Zhong asked Steward Xu to take him to the place where lime was sold, and bought a large bag of quicklime, and then returned with a full load. Steward Xu also saw that something was wrong at this time, and asked Zhou Chong about the purpose of selling these things along the way, but Zhou Chong was mysterious and did not explain.

After returning home, Zhou Zhong pushed the car all the way to his yard, except for the flour and asked Steward Xu to send it to the kitchen, everything else was left by Zhou Chong, and then he went to the kitchen in front to pull a large pot and a few water tanks, and a porcelain vase with a thin mouth and a big belly.

Just when Zhou Chonggang transported these things to his yard, Bang'er and Duo'er also ran over, and when Bang'er saw these things pulled by Zhou Chong, as well as the oil cans and lime placed randomly in the yard, he finally couldn't help but ask: "Brother, these are the materials you are going to make gifts?" ”

"That's right!" Zhou Zhong put down a large vat with a mouthful, then wiped a handful of sweat and said with a smile, "Today, my brother will perform a trick for you, and use these seemingly irrelevant materials to conjure up a good thing that you will never imagine!" ”

"Okay, okay~, Duo'er likes to watch tricks the most!" Xiao Duo'er has always believed in Zhou Chong's words, and after hearing this, she jumped up and clapped her hands and cheered. However, Bang'er was a little skeptical, she really couldn't think of any good gift that could be made from these ordinary-looking things?

Zhou Zhong also saw that Bang'er didn't believe it, but he didn't explain, facts speak louder than words, and when he made something, Bang'er would understand that his brother was not bragging. I saw that Zhou Zhong first put the quicklime into the tank, and after pouring the water, soon the inside began to 'gurgle' hot gas.

Quicklime is actually calcium oxide, which is produced after adding water to produce calcium hydroxide. Zhou Zhong waited until the chemical reaction in the tank was completed, then took the alkaline noodles and poured a part of them, and then stirred gently to fully react the calcium hydroxide with sodium carbonate. The bracelet ran up to help, but Zhou Zhong didn't dare to let the bracelet stir, because the sodium hydroxide generated, also known as caustic soda, is a highly corrosive strong alkali, if it accidentally splashes on the hand, even the belt meat will be corroded.

With the stirring of the circumference, the reaction in the solution accelerates again, and the calcium carbonate precipitate, which is not easy to dissolve in water, is the sodium hydroxide solution. However, sodium hydroxide is easy to absorb carbon dioxide in the air and turn into sodium carbonate, so Zhou Zhong poured the obtained sodium hydroxide solution into a large porcelain bottle, and then plugged it tightly with a lid and a cotton cloth, although this can not completely prevent carbon dioxide from entering, but it is much stronger than placing it in a wide mouth.

Seeing that Zhou Zhong was so careful with the caustic soda solution, Duo'er, who had been tilting her head and not speaking, finally couldn't help asking, "Brother, what did you put in the bottle, is it delicious?" ”

After hearing this, Zhou Chong suddenly laughed and said: "This is called caustic soda solution, which is a highly toxic thing, let alone drinking, even if it splashes a little on the skin, it may burn the skin, so you must not touch Duo'er and bracelet!" ”

Hearing what Zhou Zhong said was so terrifying, Bang'er was startled at first, and then said with some worry: "Brother, since this caustic soda is so dangerous, don't touch it again, what if you hurt yourself?" ”

"It's okay, my brother is not a child, and although caustic soda may hurt people, it is a very useful thing, and my brother is going to use this thing to make a trick for you!" Zhou Zhong is full of indifferent words. With caustic soda and oil, he can make soap in the Ming Dynasty, and the use of soap does not need to be said in a big way, and only he can make it in the entire Ming Dynasty, and it is definitely no worse than Xie Lingyun's rouge when he gives it away.

Speaking of ancient people, when washing their hands and faces, ordinary people generally used soapcorn, and some merchants grinded soaphorn into powder to make soaphorn powder to sell, but the washing performance of soaphorn is not strong, for example, it is difficult to wash oil stains.

In addition to soapcorn, there are also pancreas made from pig pancreas and various spices, but this thing is expensive and the raw materials are limited, so it is generally only used by rich and noble families when washing their faces and bathing. Zhou Chong's family has a little unused pancreas, it looks black and ugly, but the ability to pollute is really strong, not worse than soap, but unfortunately it is too expensive, a small piece costs more than a dozen taels of silver, which is completely a luxury in ancient society.

After preparing the caustic soda solution, Zhou Chong dug a stove on the ground with a shovel, put the big iron pot on it, and pulled a few bundles of firewood from the kitchen to light it under the stove, and after the pot was cleaned, the caustic soda solution and oil were poured into it respectively, but because there was more oil, Zhou Zhong only poured a part, and then took a stick and kept stirring.

Originally, the caustic soda solution and the oil were divided into two very clear layers, but with the heating and stirring of the circumference, the oil layer slowly decreased, and the oil layer disappeared completely. Seeing this miraculous phenomenon, Bang'er and Duo'er both widened their eyes, with expressions of disbelief on their faces, let them want to break their little heads, I'm afraid they can't understand how the oil in the pot can disappear?

In fact, this saponification reaction is not magical at all, it is nothing more than the chemical reaction between strong alkali and oil, which can be learned in middle school textbooks in later generations, and ordinary people can DIY soap at home.

However, Zhou Zhong did not stop at this time, because he was worried that the caustic soda in the solution would not be reactive, so he continued to add a little oil to it, and waited until the added oil did not disappear, then he stopped, and pulled out the firewood under the pot and extinguished it.

At this time, I saw Zhou Chong take out the salt he had just taken from the kitchen, and then turned his head to Bang'er and Duo'er who were in a daze and said, "You two girls pay attention, my brother is about to play tricks!" ”

Hearing Zhou Chong's words, Bang Er and Duo'er, who had been conquered by Zhou Chong's series of 'magical' skills, widened their eyes even more, and they didn't dare to blink at the steaming 'clear soup' in the iron pot.

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