After finishing recruiting recruits, Li Zhi was idle. www.biquge.info On this day, he sat in the house and teased his son Stone with Cui He.

The stone was ten months old and would already crawl around in bed. The kid loved to laugh so much that he giggled when Li Zhi hugged him and touched him. Cui He scratched the soles of his feet, making his son laugh even more, and kept kicking the soles of his feet. The appearance of the naïve baby made Li Zhi like it very much.

Cui He looked at Li Zhi and said, "Husband, it's time to give your son a big name!" ”

Li Zhi looked at his son who was smirking on the bed and said, "This child likes to laugh so much, it's called Huan, it's called Li Huan." ”

Cui He thought for a while and said, "How does it look like a girl's name?" ”

Li Zhi said: "Where do you look like a girl? There used to be a self-made emperor who was also called Huan. ”

Cui He nodded and said, "Then let's call it Li Huan!" ”

Li Zhi hugged his son with a smile and said loudly to him: "Li Huan, do you like this name?" ”

I don't know why, as soon as Li Zhi approached the stone to speak, the stone frowned and cried. Cui Yiyi saw that his son was crying, and he was extremely distressed, so he quickly snatched his son from Li Zhi's hand, held his son and kept shaking, and said, "Stone is good!" Don't cry, don't cry! Mother hurts the stone! ”

Li Zhi asked, "Why is he crying?" Don't like the name? ”

Cui Hexiang sniffed in front of Li Zhi's face and said, "The taste in your mouth is so big, you didn't rinse your mouth!" ”

Li Zhi smiled bitterly and said, "Where I didn't rinse my mouth, I brushed my teeth in the morning and evening." ”

In order to prevent tooth decay, the people of the Ming Dynasty also cleaned their teeth. After eating, the poor gargle with water and use their fingers to remove the food residue from their mouths. Wealthy people would buy toothbrushes made of horsetails to brush their teeth. Of course, Li Zhi also has a toothbrush, he brushes his teeth with a toothbrush in the morning and evening, but there is no toothpaste these days, and the toothbrush is not clean when brushing with water, and his mouth still smells after a long time.

The smell baked the stone, and it made him feel stinky, and the stone began to cry.

Li Zhi looked at the stone that was crying non-stop, and secretly said that the invention of toothpaste was going to be on the agenda.

"You look at the stones, I'll get rid of the bad breath!"

Li Zhi did not waste time, and left the official hall directly and walked to the soap workshop. The second grandfather, Li Yousheng, saw Li Zhi coming and said, "Li Zhi, are you here to check?" ”

Li Zhi nodded, looked around the soap workshop, and found no problems, so he said to Li Yousheng: "Make room for me!" I'm going to make something new! ”

Li Yousheng said: "Do you want to do something new? ”

"Leave it alone, get some jars and stoves and get some quicklime, salt, and soybean oil."

Li Yousheng agreed to come down and went to vacate the factory. Li Zhi rode out of the city with a few family members, found a field of reeds outside the city, cut the reeds and burned them to ashes in an iron pot. Then he took the ashes back to the soap workshop.

The room in the soap workshop has been vacated, and the tools and materials are in place. Li Zhi began to tinker with toothpaste.

The first is the extraction of potassium carbonate from plant ash. Potassium carbonate is soluble in water, Li Zhi put the plant ash in water to heat and stir the pot of water, so that the potassium carbonate is fully dissolved in water. Then the pot of turbid plant ash soup water is filtered with a burlap cloth while it is hot, and most of the water is evaporated with the filtered water until there is crystal precipitation, and a high concentration of potassium carbonate solution is obtained.

Li Zhi then dissolved quicklime in water to obtain a calcium hydroxide solution. The calcium hydroxide solution was poured into the potassium carbonate solution, and the two reacted to obtain potassium hydroxide and calcium carbonate. Calcium carbonate is insoluble in water, making the liquid after the reaction cloudy. At this time, let the solution stand for a while, wait for the calcium carbonate to precipitate, and scoop out the potassium hydroxide solution in the upper part of the solution.

With the potassium hydroxide solution, it can be saponified together with the grease. Li Zhi put potassium hydroxide and soybean oil together in a jar to heat, and kept stirring, and saw that a layer of paste-like object on top of the mixed solution gradually precipitated and floated on the solution. Li Zhi added salt to the solution for salting-out, and the paste-like object quickly became larger and thicker, forming a thick layer.

Unlike solid soap made from sodium carbonate, toothpaste made from potassium carbonate is paste-like.

That layer contains a lot of impurities, it's black, and it looks very ugly. But this is the toothpaste that Li Zhi can make at the moment. Li Zhi fished out this layer of paste-like substance and mixed it with the calcium carbonate he had just obtained. The black paste was mixed with white calcium carbonate and turned gray, which made it look better.

Calcium carbonate acts as a friction agent in toothpaste, which can improve the stain removal effect of toothpaste.

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 it in a little toothpaste in a wooden box, and began to brush his teeth with it.

Brushing and brushing, Li Zhi really brushed a lot of foam out of his mouth and brushed 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 seemed to go back to the time before the crossing, when he got up early every day to brush his teeth and catch the bus.

With the invention of more and more daily necessities, life has become more and more like before the time travel.

Li Zhi smiled, brushed it a few more times, washed off the foam with water, and then went back to the main room to call Cui He out.

"Lady, I'll show you something amazing."

In the main room, Shi Shi was tired of crying and was already asleep in the cradle, and Cui He was embroidering with a handkerchief, bored. She heard Li Zhi's call and immediately ran out, and followed Li Zhi to the room where the toothbrush was placed.

"You dip a little bit of this 'toothpaste' on your toothbrush, wet your teeth with water, and then brush your teeth!"

Cui He was stunned and said, "What is this gray thing, it's so ugly!" ”

Li Zhi smiled: "You will know when you brush it, and you can brush your teeth cleanly." ”

Cui He dipped some toothpaste in disbelief, then drank a sip of well water to wet his teeth, and brushed his teeth with toothpaste in front of the mirror. After brushing more than a dozen times, Cui He brushed out 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 the foam of toothpaste, it's the same as the foam of soap, it's stainless!"

Cui He nodded and continued to brush. After brushing his teeth up and down, Cui He rinsed off the foam with water as instructed by Li Zhi, and then brushed his teeth again with water.

After brushing his teeth, Cui He gritted his teeth and said happily: "Husband's toothpaste is useful!" Wash your teeth clean! ”

After thinking about it, Cui He tilted his head and said, "Husband, this toothpaste is so powerful, can it be mass-produced and sold for money?" ”

Li Zhi shook his head and said, "Grass ash is a good fertilizer, the quantity is limited, I can't get enough raw materials, I can't produce this in large quantities." This toothpaste can also only be used at home to clean our own teeth! At most, it is used by the people of Fanjiazhuang! ”

Cui He jumped and said, "That's good!" Wash your teeth so you won't have bad breath! (To be continued.) )