Everything is difficult at the beginning. With the first failure, the next experiment becomes much easier.

The ratio of fire and salt was reduced to one tenth of the original, and the ratio of sulfur was reduced to half of the original. After an hour, the sulfur soap with a faint fragrance was once again placed in front of Li Hao.

Cut off a piece with a knife and put it in water to dissolve it, throw it in again... Well, there was no reaction this time, try to put your fingers in, and there was a slight burning sensation.

"It seems that the proportion of fire and salt is still a bit large. Mengzi, try lowering the proportion to one-third just now." Wiping off the solution on his finger, Li Hao began to issue orders.

"Hey." Chen Meng nodded while re-setting the stove.

Li Hao was a little bored watching the side and called Lan Ling in a daze: "Let me record that in October of the ninth year of Wude in the Tang Dynasty, the great inventor Li Dejian, studied hard, did not fear hardships, overcome all difficulties, and risked the melting of strong and salty salt to try to produce the first piece of sulfur soap in human history. This is a new milestone in the history of human bathing, ending the people's life of using soapcorns to wash clothes and bathing for thousands of years."

Lan Ling's eyes were filled with little stars: "Okay young master, I'll record it right away."

Li Hao nodded reservedly: "Well, go ahead, the handwriting is beautiful. In addition, if you make a larger notebook to record, the young master will have many great inventions in the future. If the notebook is small, I am afraid I won't be able to remember it."

Chen Meng, who was busy, turned around in a hurry: "...Young Master, is this really good?"

"What's wrong with it?" Li Hao glared at his eyes with confidence: "Mengzi, I tell you, God will not give birth to me, Li Dejian. The evolution of human science and technology is like a long night. Do you understand?"

Chen Meng twitched his lips and said with a thorn in his mouth: "Ming, understand."

"I understand, come on, recite it to the young master."

Facts have proved that Chen Meng, despite his appearance of being honest, actually has a good understanding. Without waiting for Li Hao to take care of him, he immediately recited seriously and seriously: "Young Master of Heaven is not born, and the evolution of human science and technology is like an eternal night."

Li Hao nodded with satisfaction: "Well, it's not bad. You can still keep your face and bend when you stare at your eyes and tell lies. You kid will be able to have a great future in the future."

Chen Meng: “…”

...

...

In Duke Lu’s Mansion, Mrs. Cheng, Cui, found sensitively that her daughter had been depressed since she came back at noon. She looked at Lao Cheng, who was drinking, and asked softly: "Yinyin, I will see you depressed when I come back from Xianxing today, but why have you suffered? "

Cheng Yinyin was immersed in his five hundred questions, and looked up blankly when he heard this: "Ah..., mother, daughter, it's okay."

Lao Cheng glanced at his daughter: "It's okay? The food is almost over to eat."

"Dad..." Cheng Yinyin felt a little embarrassed, lowered her head and hesitated for a while, and suddenly raised her head and said, "Dad, what kind of person do you think Li Dejian is?"

"He? I don't know." Old Cheng stopped at the wine glass and thought for a while: "That kid's ability to pretend to be stupid is very good, even I can't compare to him."

"My daughter found that this person seemed to know everything, poetry and medical skills, and his calculations were many times better than ordinary people. Dad, mother, do you know that in the morning, he actually counted all the accounts of Xianxing for one year in just half an hour."

"This is impossible." Cui's face changed and he said firmly: "Even if Xianxing's account book is the best account book in Chang'an, it will take three or five days to count it."

"Mom, this is what my daughter saw with her own eyes." Cheng Yinyin shook her head, put down the chopsticks in her hand, and said intermittently what happened during the day. In order to increase the authenticity of the whole thing, she added: "The shopkeeper in the store has always been there, and he can prove that what her daughter said is not false."

Compared to Cheng Yinyin, who was obsessed with the truth and falsehood, Cui obviously cared more about the numbers she mentioned. After thinking about it, he asked, "Yinyin, did you just say that Li Dejian taught you a new way of counting?"

"Yes, my daughter tried it and found that those numbers were calculated more easily than before." Cheng Yinyin said, while asking the maid to take the straw paper for her own calculations during the day.

The time was not long, and the straw paper was retrieved. Cheng Yinyin explained to them the Chinese characters corresponding to each number in front of Lao Cheng and Cui, including vertical calculations, double accounting and so on.

After hearing this, Cui's expression changed. He waved away all the irrelevant people in the room and looked at Lao Cheng: "Master, what do you think about this?"

Old Cheng snorted: "Hmph, Li Dejian is a little bastard like him, and he shouts no, but he is more attentive than anyone else."

Cheng Yinyin heard the implication of "showing diligence" in old Cheng's words, and said angrily: "Dad!"

Cui also gave Lao Cheng a blank look: "Master, what I am talking about is not the boy's attitude, but this new method of counting. This method counts clearly and simply. If I think it is my own, I will never pass on this method to others."

Cui’s meaning is very simple.

It is normal for a child to be ignorant, so it is better to take out the treasures at home to show off.

But children are ignorant but adults must be ignorant. Such a novel method of counting has never appeared in the world, which shows that it must be a secret of the Li Jing family.

Now that it has been rumored through Li Dejian, what would Li Jing think has become the primary question.

If the two families have a falling out over this matter, it will not be a good thing for the Cheng family or the Li family.

Lao Cheng looked indifferent: "What's the matter? I don't feel sorry for selling my father-in-law. I, Lao Cheng, don't care whether this is Li Jing's secret. Anyway, that kid taught my daughter, this is the algorithm of my Cheng family. Besides, Yinyin is the daughter of his Li family sooner or later. Even if he learns it, what if he does, it can't be considered a spread."

Cheng Yinyin: "..."

Why did it get into marriage again? Although Li Dejian's knowledge is quite admirable, if he really married him... I haven't considered it well yet.

Cui did not refute Lao Cheng in a rare way, but just frowned and said, "That's it, but Master, can you tell me this new method be used by our family?"

Old Cheng looked impatient: "It's all right. You women are really like this, and then you think, aren't it just a few numbers? Why can't you use them? Besides, over the years, I, Old Cheng, have never seen Li Jing use this thing, so maybe these numbers are made by Li Dejian himself."

Cui thought for a while: "Master, it's better to do this. Tomorrow you take a number and hand it over to Duke Wei, and see his reaction before talking."
Chapter completed!