After he was busy recruiting new soldiers, Li Zhi took some time off. On this day, he sat in the house and teased his son Shitou with Cui He.
Shitou is already ten months old and can already crawl around on the bed. This child likes to laugh very much. He giggles when Li Zhi hugs him and touches him. Cui He scratches his soles, which makes his son even more amused.
He laughed loudly and kept tapping his feet. Li Zhi liked that childish look very much.
Cui He looked at Li Zhi and said, "Husband, it's time to give your son a good name!"
Li Zhi looked at his son who was giggling on the bed and said, "This kid likes to laugh so much, let's call him Huan, Li Huan."
Cui He thought for a moment and said, "Why does it sound like a girl's name?"
Li Zhi said: "How does he look like a girl? There used to be a self-made emperor named Huan."
Cui He nodded and said, "Then let's call him Li Huan!"
Li Zhi smiled and hugged his son, and said loudly to him: "Li Huan, do you like this name?"
I don't know why, as soon as Li Zhi approached Shi Shi to talk, Shi Shi frowned and started crying. When Cui Heyi saw his son crying, he felt particularly distressed. He quickly snatched his son from Li Zhi's hand, hugged him and shook him, saying
Li Zhi asked sarcastically: "Why is he crying? Don't like this name?"
Cui He came up to Li Zhi's face, smelled it, and said, "The smell in your mouth is so strong, you didn't rinse your mouth!"
Li Zhi smiled bitterly and said, "I don't rinse my mouth. I brush my teeth morning and night."
In order to prevent tooth decay, people in the Ming Dynasty also cleaned their teeth. Poor people would rinse their mouths with water after eating and use their fingers to remove food residue from their mouths. Rich people would buy toothbrushes made of horsetails to brush their teeth. Of course Li Zhi also had a toothbrush, which he used morning and night.
Brush your teeth with a toothbrush, but these days there is no toothpaste, so brushing with water will not clean your teeth. After a long time, your mouth still smells.
The smell hit Shi Shi and made him feel bad, so Shi Shi started to cry.
Li Zhi looked at Shi Shi who was crying non-stop and secretly said that the invention of toothpaste would be on the schedule.
"You look at the stone, I'll get rid of the bad breath!"
Li Zhi left the official hall without wasting time and walked to the soap workshop. Second grandfather Li Yousheng saw Li Zhi coming and said, "Li Zhi, are you here to check?"
Li Zhi nodded and looked around the soap workshop. He didn't find any problems, so he said to Li Yousheng: "Make a room for me! I want to make new things!"
Li Yousheng said: "Are you going to make something new again?"
"Don't worry about it. Get a few pots and a stove in the vacated room, and get some quicklime, salt and soybean oil."
Li Yousheng agreed and went to vacate the factory. Li Zhi took a few servants and rode out of the city. They found a reed field outside the city, cut the reeds and burned them into ashes in an iron pot. Then he took the ashes with him
Back to the soap workshop.
The room in the soap workshop has been vacated, and the tools and materials are in place. Li Zhi started tinkering with the toothpaste.
First, potassium carbonate is extracted from plant ash. Potassium carbonate is soluble in water. Li Zhi heated the plant ash in water, stirred the jar of water, and allowed the potassium carbonate to fully dissolve in the water. Then he heated the jar of turbid plant ash.
Filter the soup through linen, and evaporate most of the filtered water until crystals precipitate to obtain a high-concentration potassium carbonate solution.
Then Li Zhi dissolved quicklime in water to obtain a calcium hydroxide solution. Pour the calcium hydroxide solution into the potassium carbonate solution, and the two reacted to obtain potassium hydroxide and calcium carbonate. Calcium carbonate is insoluble in water, so the reacted liquid
It becomes turbid. At this time, let the solution stand for a while, wait for the calcium carbonate to precipitate, and scoop out the potassium hydroxide solution at the top of the solution.
After having the potassium hydroxide solution, you can perform a saponification reaction with the oil. Li Zhi put the potassium hydroxide and soybean oil together in a jar and heated it. He kept stirring and saw that a layer of paste-like substance on the mixed solution gradually gradually
It precipitated and floated on the solution. Li Zhi added salt to the solution to salt out, and the layer of paste quickly became larger and thicker, forming a thick layer.
Unlike solid soap made from sodium carbonate, toothpaste made from potassium carbonate is in the form of a paste.
That layer of stuff contains a lot of impurities, is black, and looks very ugly. But this is the toothpaste that Li Zhi can make so far. Li Zhi fished out this layer of paste-like substance, and mixed it with the calcium carbonate he just obtained
Mix it together. The black paste-like substance is mixed with the white calcium carbonate, and it turns gray, which looks better.
Calcium carbonate acts as a friction agent in toothpaste, which can improve the toothpaste's stain removal effect.
Li Zhi put the toothpaste he made into a wooden box and brought it back to the official hall. Li Zhi found his toothbrush in the wing, dipped a little toothpaste in the wooden box into the toothbrush, and started brushing his teeth with the toothpaste.
As he brushed, Li Zhi really brushed a lot of foam out of his mouth, brushing his teeth clean. Li Zhi took a glass mirror and looked at it, and saw that his mouth was full of toothpaste foam, and he felt as if he had returned to the past.
Before the time travel, I got up early every day to brush my teeth and catch the bus.
As I invent more and more daily necessities, my life becomes more and more like before time travel.
Li Zhi smiled, brushed a few more times, washed away the foam with water, and then went back to the main room to call Cui He out.
"Madam, let me show you something amazing."
In the main room, Shitou was tired from crying and fell asleep in the cradle. Cui He was embroidering with a handkerchief and was bored. She ran out immediately after hearing Li Zhi's call and followed Li Zhi to the place where the toothbrushes were placed.
In the wing room.
"You put a little bit of this 'toothpaste' on your toothbrush, wet your teeth with water, and then try brushing your teeth!"
Cui He was stunned and said, "What is this gray thing? It's so ugly!"
Li Zhi smiled and said: "You will know after you brush it, you can brush your teeth clean."
Cui He dipped some toothpaste dubiously, then drank a sip of well water to wet his teeth, then brushed his teeth with toothpaste in front of the mirror. After brushing for a dozen times, Cui He produced a mouthful of foam.
Cui He saw his mouth in the mirror and said in a panic: "Why am I foaming at the mouth?"
"It's not foaming at the mouth, it's toothpaste foam, just like soap foam, it removes stains!"
Cui He nodded and continued brushing. After brushing his teeth up and down, Cui He followed Li Zhi's instructions to rinse away the foam with water, and then brushed his teeth again with clean water.
After brushing his teeth, Cui He bit his teeth and said happily: "My husband's toothpaste works! The teeth are cleaned!"
After thinking about it, Cui He tilted his head and said, "My husband, this toothpaste is so powerful. Can it be mass-produced and sold for money?"
Li Zhi shook his head and said: "Plant ash is a good fertilizer, but the quantity is limited. I can't get enough raw materials to produce this in large quantities. This toothpaste can only be used at home to clean our own teeth! At most, it will be supplied to Fanjiazhuang.
People use it!”
Cui He jumped a little and said, "That's good! Clean your teeth and you won't have bad breath!"
