When the sulfuric acid in the crucible is burned dry, many white crystals remain, which are sodium sulfate produced by the reaction of concentrated sulfuric acid with table salt.

Luyo added water to the sodium sulfate, and then stirred with coke powder.

When the water in the crucible is boiled dry, all that remains is a pile of earthy yellow crystals, which are impure sodium sulfide.

Then Luyo added water to the sodium sulfide, and then added limestone powder and stirred.

After the water is boiled dry again, all that remains is white crystals, which is soda ash.

Luyo added water to the soda ash, and then added lime powder and stirred.

When the water is boiled dry, a white translucent crystalline solid remains, which is caustic soda.

Then Luyo took another clay pot, filled it with water, and then slowly stirred with caustic soda.

Caustic soda absorbs water and releases heat, and the temperature of the solution quickly rises, and after the temperature of the solution is right, Lu Yo pours in sesame oil and stirs, until the solution becomes viscous.

Then Luyo set aside the clay pot containing the viscous substance, then took another clay pot, added water, caustic soda, and lard, stirred it until it became viscous, and then set it aside.

That's right, Luyo was making soap, and he was going to exchange the right to sell soap and rich merchants for money.

Lu Yao then sent people to the counties and informed the rich merchants to come to the state capital tomorrow.

Once the two jars of soap had cooled and solidified, Luyo smashed the pots and cut them into small cubes.

Luyo called soap made from vegetable oil bath soap and soap made from animal fat laundry soap, and the two soaps were packaged in oiled paper with different patterns.

The next day, all the wealthy businessmen of the state gathered in the main hall of the state capital.

At this time, all the rich merchants were worried in their hearts, and their faces were full of sorrow, because they knew the current situation in the state, and they all thought that Luyo was trying to exploit them.

When Lu Yo came to the main hall, he saw that the atmosphere in the hall was lifeless, and he knew what they were thinking when he looked at the miserable expressions of the rich merchants.

Lu Yo then smiled and said, "Don't worry, I won't borrow money and food from you today. ”

Lu Yo thought that Situ Jing had borrowed money and grain from the rich merchants, and now that Situ Jing was dead, the rich people would certainly be worried, so he said: "I promise that the money and grain borrowed from you by the state government will be doubled, but I still need you to give me a little time, and I will definitely pay it back three times before the summer next year." ”

The wealthy merchants all showed shocked and skeptical expressions when they heard this, they could not imagine how Luyo could raise so much money and food in one year, and if he only relied on the state's taxes, it would be good to be able to pay the full amount in a year.

At this time, a wealthy businessman suddenly thought: Could it be that Luyo wants to plunder other states? Chuzhou has just experienced the Yu Huang Rebellion, and its vitality has been greatly damaged, where can it have the ability to invade other states? No, if Luyo is finished, who will pay me back?

The rich merchant thought about it, so he said to Lu You: "Envoy, it is also our duty to resist the thieves, so that you don't need to return it three times, just return the amount." ”

Other wealthy businessmen also thought that it would be good to be able to return to their roots, and where they dared to be greedy, so they also said that they could lend as much as they wanted.

Lu You's face suddenly changed, and he said angrily: "How can this be reasonable! I am the shepherd of a state, how can I not believe in my words? I said that if I pay back three times, I must pay back three times, and whoever dares not to do it is an enemy of me! ”

When the wealthy businessmen heard this, they trembled, and they were all afraid to speak again.

Lu You, seeing that everyone was frightened, said with a smile: "Actually, I summoned you here today to give you a chance to make money. ”

When everyone heard this, their faces were full of disbelief, so Lu Yao shouted outside the hall, "Someone is coming." ”

When all the wealthy merchants heard this, they all looked out of the door vigilantly, and saw four servants walking to the middle of the main hall with two wooden basins and a few white clothes, and everyone was relieved.

Luyo then walked up to the servants, and two of them raised their hands.

Luyo pointed to the hands of the two and said, "Everyone, please see. ”

When the rich men looked at each other, they saw that the hands of the two servants were covered with oil and disgusted.

"Ladies and gentlemen, it's time to witness the miracle!" Luyo said to the crowd with open hands.

When everyone heard this, their faces were full of doubts, and they didn't know what miracle would happen.

They saw two servants with oily hands each take out two pieces of yellow from two paper bags, and then dip their hands in a wooden basin filled with water, and then smear them on their hands.

Then the two servants began to rub their hands, and there was a lot of foam on their hands, and the rich merchants were amazed.

When the two servants cleaned the foam on their hands, they raised their hands again to show the rich merchants, who were stunned for a moment.

By this time, the hands of the two servants had become very clean, and there was no trace of oil in sight.

The wealthy merchants had never seen such a miraculous thing, and they were all amazed.

Lu Yue couldn't help but smile when he saw the wealthy businessmen looking like Grandma Liu entering the Grand View Garden, and then said, "Everyone, please continue to watch." ”

When the wealthy merchants heard this, they all fell silent, and looked at Lu Yo intently.

Luyo then asked the other two servants to unfold the two white clothes, and then pointed to the stains on the two clothes and said, "Look, everyone. ”

The rich people took a closer look, and saw that there was a large stain on the chest of the two white clothes.

Luyo nodded to the two servants who were holding the clothes, and the two servants began to wash them with soap in another tub of water.

After a while, when the two servants picked up the clothes again, they no longer saw any stains on the clothes, and both clothes were as good as new.

Seeing this, the wealthy businessmen were shocked and amazed.

A wealthy merchant saw that it was soap that worked, so he asked Luyo, "Dare to ask the envoy, but the yellow-colored thing washed the stains off the hands of those two men and those two clothes?" ”

"Exactly." Luyo affirmed.

When the wealthy merchants heard this, they were immediately full of curiosity about soap, and Lu Yo immediately said: "You can also try it for yourself, this handwashing thing is called bath soap, which is used to clean the body, and this laundry washing thing is called laundry soap, which is used to clean clothes." ”

Luyo ordered his servants to refill many basins of water and bring many strips of white cloth to the main hall, and the rich merchants began to deliberately stain their hands and strips of white cloth, and then washed them with soap.

After a while, the wealthy merchants themselves verified the effect of soap.

Lu Yo then picked up a piece of soap and said to the rich merchants: "This bath soap and laundry soap are the only ones I can make, and I plan to sell them for thirty dollars each, a bath soap that can be used for several months by one person, and a piece of laundry soap that can wash hundreds of clothes." ”

When the wealthy businessmen heard this, their eyes lit up, and if what Luyo said was true, then the prospects for bath soap and laundry soap would be immeasurable.