After buying soda ash, he still needed to buy quicklime. Quicklime was the most commonly used building material in the Ming Dynasty. There would definitely be shops operating in Tianjinwei City. Li Zhi found Barracks Street, where the masons gathered. He used twenty wen to find someone to lead the way and bought quicklime from a brick street on the east side of the Wei City.
Quicklime was two copper coins per catty, so he bought one catty for the experiment.
The soap reaction required an alkali-based oil. Next, he had to buy oil. At the end of the Ming Dynasty, soybean oil was widely used and was cheap. Without needing anyone to lead the way, they found the vegetable market near the well and the oil stall.
"Zhao San, give me four catties of soybean oil.
"Four catties for 90 wen, are you selling or not? If you want to sell it, I'll come back tomorrow to buy more!”
Hearing this, Zhao Sancai was no longer a fool. He had really become smarter. Zhao San wanted to do business, but he couldn't pull his face. He thought for a moment and said with a straight face,"Then I'll give it to you!"
He handed over 90 copper coins and took the oil gourd. Zhao San handed the oil gourd over and couldn't help but ask,""Are you still coming back tomorrow?"
Lin Feng smiled and said,"If you were cheaper, I would buy it every day!"”
Oil was the key raw material, and it consumed the most. If the oil could be cheaper, the cost of soap could be reduced by a lot, which was worth bargaining with Li Zhi.
Hearing this shrewd words, Zhao San finally entered the state of doing business. He no longer lied and said,"If you come back tomorrow, the price is negotiable!”
He smiled, put the gourd on his waist, and left the market.
Carrying the oil gourd and two bags of raw materials, he returned to his shop.
Lin Feng walked into the kitchen and started to produce the first batch of soap.
Before he transmigrated, Lin Feng had once designed soap for a local soap factory. From the beginning to the end, he had a complete understanding of the production process of the soap industry. It was not difficult for Lin Feng to make soap in this era.
Although it was his first time using the local method, he was familiar with it and did it easily and happily.
Lin Feng found a large wooden bucket filled with well water. He threw eight taels of quicklime into the water, and with a sizzling sound, the bucket of water began to boil.
Quicklime reacted with water to form a solution of calcium hydrogen, which was also known as slaked lime. During the reaction, a large amount of heat was released, heating up the water in the bucket.
He poured a pound of soda ash into the bucket of slaked lime. As soon as the soda ash was poured in, the bucket of water instantly boiled as if it was boiling. A large amount of water vapor was emitted, immediately evaporating one-third of the bucket of water, covering the entire kitchen in mist. She quickly added more cold water into the bucket to lower the water temperature. At this time, the water in the bucket was already muddy, and the bottom of the bucket could no longer be seen clearly.
The reaction between the slaked lime, calcium hydrogen, and the soda ash and the soda ash produced calcium carbonat and the soda ash and the soda ash. The calcium carbonate-filled bucket was turbid, and the heat released by the reaction dried up the water.
Lin Feng let the wooden bucket sit still for a while. The calcium carbonite gradually sank to the bottom of the bucket, and the transparent solution of soda, which was also called soda, floated on the surface of the calcium carbonite. He asked Li Zhi to scoop the solution into another wooden bucket and filter it with linen cloth to remove the calcium carbonite.
He left half of it and poured the other half into the iron pot.
He placed the iron pot on the stove and started a fire with a match and firewood. He heated the soda solution and poured the soybean oil into the pot bit by bit. After pouring the soybean oil in, he stirred it with a stick. Alkali and oil reacted at high temperatures. The oil gradually disappeared, and a layer of viscous liquid appeared on the top of the iron pot.
After burning for fifteen minutes, he scooped out the liquid with a spoon and observed it. When he found that there was still some oil, he continued to add the remaining soda solution. This was repeated until all the fat was consumed and there was no more oil in the sticky substance.
Among the sticky liquid, there was soap. However, the soap was still mixed with other things and dissolved in the water. They had to be separated by salting out. He poured the soda ash powder into the viscous liquid to salt out, heated it, and stirred it. The Na ions in the soda ash forced the soap to separate from the water. After heating and stirring for half a quarter of an hour and letting it stand for a while, the soap gathered above the solution.
However, such a product was still not pure enough. There were still impurities dissolved in it. He then heated it up and separated it with an alkali-like solution to obtain a soap with a relatively high purity.
After the alkali-separation was completed, a thick layer of yellow translucent solid floated on top of the solution. It was the high-purity soap.
I got the soap I wanted
Lin Feng began to sell. A month later, Lin Feng had earned 80,000 taels of silver.
This book comes from：m.funovel.com。