Soon, the servants of the Shen family bought everything Zhao Feng wanted.
Zhao Feng looked at the things they bought, nodded with satisfaction and said.
"Yes, with these things you can turn all these fabrics into pure white!"
Shen Chuchu also came over and looked at the things bought by the servants with some curiosity, but found that most of the things bought by the servants had never been seen before.
"What's this?"
Shen Chuchu showed a curious expression on the side, and Zhao Feng said to Shen Chuchu while handling those things.
"This black thing is plant ash. It only needs to be washed and soaked with water to make alkaline water."
"If you want to make caustic soda that makes fabric fade, alkaline water is indispensable. After all, soda ash is not available yet, so we can only use alkaline water instead."
"But there are some soda ash mines and even some alkaline lakes that can be used to make soda ash in large quantities."
Zhao Feng said this while pouring all the plant ash into the bucket, and then kept stirring.
He pointed to the white stones on the other side and said.
"This thing is called limestone, and it should be a medicinal material now."
The servants nodded as expected.
"Miss, we did buy this thing from the drug store. For these stones, we searched all the drug stores in the entire county!"
Shen Chuchu's eyes widened in surprise.
"I didn't expect it to be a medicinal material. Can even medicinal materials be used to fade the color?"
Zhao Feng couldn't help but chuckle. This limestone was just quicklime. It didn't have a lot of applications in this era, so it was used as a medicinal material.
In fact, limestone has many uses. It can not only be used to make some chemical raw materials, but can also be used to make many things later.
After Zhao Feng got out the alkaline water, he put the alkaline water in the iron pot and started to heat it. When it was very hot to the touch and the temperature was about 70 degrees, Zhao Feng added the limestone soaked in water.
After quicklime is soaked in water, it will become hydrated lime, which is calcium hydroxide. When it is dissolved in water and heated with alkaline water at the same time, a replacement reaction will occur between the two to generate caustic soda and sodium hydroxide!
This is just a very simple chemical reaction. Although the caustic soda produced in this way is not much, it is enough for simple fading of those fabrics.
After all, Zhao Feng didn't want to fade all the fabrics. He only needed to turn a small piece of fabric into pure white to convince Shen Chuchu and others that this method could be used.
Soon, a lot of things inside settled down, but this was not the caustic soda that Zhao Feng needed, but sodium carbonate.
Zhao Feng filtered out the precipitated matter and continued to boil the clear liquid.
Sodium carbonate continued to precipitate out, until some liquid was left behind. Zhao Feng quickly evaporated and concentrated the caustic soda liquid, and after cooling, it turned into solid caustic soda.
But Zhao Feng does not have to use solid materials. He only needs to soak the fabric with these liquids to achieve the fading effect.
Shen Chuchu brought a piece of cloth, and Zhao Feng stuffed it directly into the pot. As the warm liquid continued to soak the cloth, the color on the cloth became lighter and lighter, and all the pigments melted into the water. .
When Zhao Feng took out the piece of cloth, Shen Chuchu and the others couldn't help but widen their eyes, not believing what they saw.
I saw that the piece of mulberry linen cloth had turned into an off-white color that was very close to pure white!
Although it is only off-white, it is much better than the previous tawny color. Using such fabric for dyeing will definitely make the color more uniform and translucent!
But Zhao Feng didn't look particularly satisfied and shook his head.
"The raw material is still impure. If we can find soda ash, the product will be better!"
Shen Chuchu couldn't care about anything else and quickly wanted to take the fabric in her hand and examine it carefully, but Zhao Feng quickly stopped her.
"Wait a minute, there's caustic soda on it, don't you want it for your hands?"
Zhao Feng shook his head, cleaned the remaining caustic soda on the cloth, and then handed it to Shen Chuchu.
Shen Chuchu touched the cloth and found that under the action of caustic soda, not only the color on the cloth was lightened a lot, but the cloth even felt softer.
Zhao Feng knew that this was actually because he was too eager for success, so the caustic soda solution had damaged some fibers of the cloth.
When it comes to actual operation, the concentration of the solution needs to be carefully prepared to ensure that it fades without damaging the fabric too much.
Zhao Feng kept this in mind, but Shen Chuchu cheered excitedly, then ran over directly and looked at Zhao Feng with a look of joy.
"Oh my God, you are so awesome!"
"I didn't expect that you only used this little stuff to turn these fabrics white!"
"You are so awesome as a servant!"
Zhao Feng waved his hand with a smile, indicating that it was not worth mentioning, and then said to Shen Chuchu.
"You should try the method I proposed before."
"Maintaining a certain temperature when dyeing can make the color better!"
Seeing such a magical scene, Shen Chuchu had already believed Zhao Feng. Then according to Zhao Feng's words, she quickly heated the dye vats with fire and threw the piece of off-white cloth into the dye vats.
When I took it out after a while, I found that the color on it was indeed very translucent, and the dye was evenly distributed!
Shen Chuchu looked at Zhao Feng with great surprise, and then said impatiently.
"No, I have to show this piece of fabric to my father quickly!"
"You are a very talented servant. What is your name?"
Zhao Feng smiled and told Shen Chuchu his name, but Shen Chuchu was stunned for a moment, and then asked in surprise.
"You can't be the one who killed the tiger before, right?"
Zhao Feng looked at Shen Chuchu with some surprise, but a blush flashed on the latter's face.
"It looks like it's you. I didn't expect you not only to be able to kill a tiger, but also to be so smart!"
"But why did you come to our place to be a servant?"
Zhao Feng scratched his head but did not tell Shen Chuchu the truth, and the latter ignored Zhao Feng and hurriedly showed the piece of cloth to Shen Baochuan.
Shen Baochuan was very satisfied after reading it. He didn't expect that what Zhao Feng said was actually true!
He just came here and directly solved a problem that they had been having for a long time. Even any dyeing shop had not thought of fading the fabric first and then dyeing it. Then they would definitely be able to take advantage of this!
