Sang Yi is a person who is used to catching thieves and has a set of tracking and surveillance, so he is responsible for tracking Qin Huailiang and finding the two people behind him.

Xu Ping returned to the restaurant and made up an excuse to take a silver tin with a slightly different color from his mother. It should be the medicine silver that was exchanged for Grandma Hong.

Zhang Sanniang was impatient. Xu Ping did not dare to tell her the truth. She just secretly ordered Liu Xiaoyi to keep an eye on Grandma Hong these days, and report to her father Xu Zheng if there is anything wrong.

After making things happen, Xu Ping returned to Zhuangzi.

These days, we are harvesting alfalfa, leaving apart roots in time to make wintering. Alfalfa is not suitable for silage, but is suitable for making hay. A more professional saying is that it is necessary to be tempered. It is best to dry it into half-dry and then store it in an appropriate way.

Xu Ping specially designed a baling machine to make the collected alfalfa into large bales to facilitate storage and transportation. Forging grass into dense bales can not only ensure stable quality, but also save space during long-distance transportation. At this time, the forage collected by the imperial court was scattered. According to the circumference, the price of one circumference is as high as that of one yard of grain, but it is much more difficult to transport grass than one yard of grain.

When he returned to Zhuangzi, Xu Ping first went to the wheat field to see the alfalfa harvest.

The baler is powered by donkeys and uses the principle of crank sliders to squeeze through fixed channels to form. When Xu Ping arrived, Xu Chang was instructing people to operate the three balers.

When Xu Ping saw Xu Chang came up to see the tribute and asked him, "Why is Dalang free to come here today?"

Xu Ping said: "The weather has been cold recently, so the alfalfa in the field must be taken back as soon as possible. If the alfalfa is late, it will lose its nutrients and cattle and sheep will no longer like to eat it."

"Gao Daquan and Sun Qilang are in the ground with their men for a moment, which should not be inconvenient."

Xu Chang said, holding the bale that came down from the baler and exclaimed: "The way Dalang thought was really good. The grass was pressed into large pieces like this and it would not take up space. Otherwise, there would be so many alfalfa on our farm this year, even if it was taken back, there would be no place to put it."

Xu Ping nodded, went up to touch the tightness of the bale, and sighed secretly. In the end, the animal power was still incomparable to the machine. A bale was driven by three donkeys, and the density of the bale was still not as high as that of the machine in his previous life, so he had to use it.

After inspecting the alfalfa harvest, Xu Ping returned to his yard.

Xiuxiu was doing needles and threads in the sun in the leeing place in the yard. When she saw Xu Ping, she hurriedly said, "The official is back. I have never seen you these days."

Xu Ping asked her with a smile: "Do you miss me?"

Xiuxiu just shook her head and didn't speak.

Let Xiuxiu be busy with her own efforts, Xu Ping entered the study and took out the Yinying he had asked for from his mother to take a closer look. The so-called silver is white in color, very similar to the appearance of the silver, and it is also heavy in his hand. If it weren't for the intention, the real one could be distorted from the real one.

Xu Ping had a real silver tin in his hand, which was specially kept, so he took it out and put it together with the medicine silver to watch it carefully. The difference between true and false appeared. One was that there were slight differences in the color, and the other was that in order to distort the real one, the two silver tins were exactly the same, but the density of copper was smaller than that of silver, and the weight was lighter.

Xu Ping remembered that the hardness of white copper was much greater than that of white silver, so he went out to ask Xiuxiu for a needle. Sure enough, there were scratches on the real silver with a slight stroke, and the medicinal silver was not so obvious.

Holding this piece of medicine silver, Xu Ping fell into deep thought. Is this really nickel-white copper? Xu Ping was not sure, but he didn't believe that nickel could be refined in this era. Nickel is not difficult to smel, but in fact it is similar to iron smelting. It is mainly because it was difficult for the ancients to recognize the existence of this metal. Nickel is very easy to form alloys with other metals. Meteorite often contains nickel, so in ancient times, some meteorite iron was used as high-quality steel to make swords and swords. It was not only extremely sharp, but also not rusted. It is actually a type of stainless steel.

The same problem is still the problem. If you have the ability to make nickel and white copper, why not make stainless steel? That is to say, it can deceive many people by meteorite flying from the sky, and it is not dangerous.

The wind blew all night last night, and it was already clear this morning. The sun shone on people warmly. Xu Ping couldn't figure it out, holding the silver medicine, lying on the desk and unknowingly fell asleep.

I felt something was moving in my dream, and Xu Ping woke up.

It turned out that Xiuxiu was afraid that Xu Ping would catch a cold, so she put a blanket on him.

Seeing Xu Ping awakening, Xiuxiu said embarrassedly: "I've disturbed the official to rest."

Xu Ping shook his head: "It's okay."

Seeing Xiuxiu holding a yellowish-brown thing in her hand, Xu Ping asked her: "What is this?"

Xiuxiu said: "This is erotic. I asked Su'er what she wanted. If she wrote the wrong words, she could use it to change it."

Xu Ping said "Oh". Orochi is an ancient modification liquid. If the words are written incorrectly, they are used to modify them. This is how the idiom "orochi" comes from.

Xiuxiu said again: "I originally put it on the table, but the officials didn't see it. It was almost in your mouth when I was sleeping on my stomach. This thing is poisonous and difficult to put in. I will put it away and never put it in randomly."

"poisonous?"

Xu Ping asked casually.

As soon as he said that, Xu Ping's mind flashed and he slapped the table suddenly: "I understand!"

This scared Xiuxiu and patted her chest and asked Xu Ping: "What do you know? This shock will scare me!"

Xu Ping laughed and patted Xiuxiu on the shoulder: "It's not about Xiuxiu's business, it's an official. I have something I can't figure out. With Xiuxiu, you remind me, and I'll figure it out in a moment."

Xiuxiu asked curiously: "What is the matter that makes the officials care so much? Tell me and listen to it."

Xu Ping smiled and shook his head: "This is not a good thing, so I can't tell you."

Xiuxiu made a disgusting expression: "I don't want to listen yet!"

After saying that, he left the study room and continued to work hard on his own.

Xu Ping looked over and over again the medicine silver in his hand and said to himself: "I am so stubborn that I think it is nickel and white copper, so I can't figure it out. Thanks to Xiuxiu's orchid, I remember that white copper is not the only one, this should be another, arsenic white copper, isn't it?"

Xu Ping took a look at it by chance when he was looking for nickel-white copper in his previous life. There was also a kind of copper alloy in Chinese history, namely arsenic-white copper. Arsenic-white copper is very similar to nickel-white copper, so that the ancients often confused it. However, because arsenic-white copper is toxic and has no outstanding performance, it has basically disappeared in later generations.

When ancient Chinese alchemists' trick of turning stones into gold was increasingly undeceptive, they developed this kind of thing again. When the arsenic content in copper and arsenic alloys is low, it turns golden yellow, that is, medicine gold. When the arsenic content exceeds 10%, it turns silver-white, which is the so-called medicine silver.

The difference between medicine and real gold is quite obvious, so it has not spread. The so-called secret technique of medicine and silver has always been popular. The reason why Xu Ping associated it from orchid is because the earliest medicine used to do medicine and silver is orchid. The ingredient of orchid is arsenic sulfide. It is generally heated to arsenic oxide, that is, arsenic, and then reduced to arsenic with charcoal, and transformed into copper-arsenic alloy with liquid copper. Later, arsenic became a common substance, so it replaced the orchid-arsenic realgar used when do medicine and silver, and became the secret medicine in the art.

This is the chemical reaction of the principle of yellow and white atractylodes. Of course, in the actual process, it depends on the specific operation method to obtain silver-white arsenic copper.

After thinking about this, Xu Ping breathed a sigh of relief.
Chapter completed!