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In the evening, Li Zhan, Zhang Damao, Li Sheng, Zhang Gong and Zhang Jian finally returned home.

Among them, Li Sheng carried a basket of salt mines, and Zhang Gong and Zhang Jian carried saltpeter mines. They were really amazing. They were about 100 kilograms. These three guys seemed to have nothing to carry. Li Zhan could only envy this physical strength.

Everyone was surprised to see the salt mine that Li Sheng carried back, and they didn't know why they carried this thing back.

But when everyone heard Zhang Damao say that Li Zhan could turn the toxic salt mine into non-toxic salt, everyone showed a shocked expression.

In fact, the technology of salt making in the Tang Dynasty was already very mature. According to historical records, in the early Tang Dynasty, the process had been greatly improved, and the taste of salt was greatly improved. For that time, the technological revolution was relatively large. The production model at that time was becoming more and more specialized, and the fineness of salt was also very high.

At that time, there was a method of production that was to use five steps to complete it. It can be said that the industrialization of large-scale production had been achieved, and the final efficiency began to become higher.

But although their technology is mature, why did the Tang army still use jealous cloth?

What is vinegar cloth? It is mentioned in Tang bricks, which is a cloth cooked with vinegar. When eating, just put the "vinegar cloth" into the water and the vinegar smell inside will come out. This is a way to store vinegar. After all, cloth is much easier to carry than liquid vinegar.

Especially during marching and fighting, it is not convenient to carry various bottles and jars of seasonings. Therefore, we came up with the method of storing "vinegar cloth", which is both easy to carry and can meet people's requirements for food taste.

During the meal, the soldiers simply cut a small piece of cloth soaked in vinegar and cook it together with military rations. It won’t take long to eat a delicious meal.

However, the taste is really not very good. If you ask me to eat it, you may vomit.

When the technology is mature, vinegar cloth still needs to be used. What is the reason? There is a difference between the technology is mature and the mass production. When the technology is mature, salt can be produced, or even fine salt that is close to modern times, but its quantity cannot be supplied.

There were three methods for making salt in the Tang Dynasty: the first sea salt, the second pond salt, and the third well salt.

Sea salt is to evaporate some sea water with high salt content. Generally, the sun and natural evaporation will be used, and then some of the salt are cleared to remove impurities and remove some impurities.

Pond salt is salt taken from a salt lake. The ingredients are the same as sea salt, and of course the same method.

Finally, the well salt is used to extract underground brine (generated naturally or after salt ore injection) by drilling wells. The salt produced is called well salt, and the vertical shaft that produces well salt is called salt well.

The first two are simply sun-drilled, and the latter one needs to dig a well. When digging a well, use a "one-shaped" drill bit to pound the rocks by impact, inject water or use groundwater to draw out the rock chips and water with bamboo tubes.

The well diameter of Zhuotong Well is only the size of a bowl, and the well wall is not easy to collapse. The Tang people also removed the joints of the big Nan bamboo, connected the head and tail, wrapped it with hemp rope, applied it with putty, and went down to the well as a casing to prevent the well wall from collapse and fresh water from immersing. When taking the brine, use fine bamboo as a brine drain cylinder, insert it into the casing, and use cooked skin as an opening and closing valve at the bottom of the barrel. One barrel can draw several buckets of brine. A large wooden frame is erected on the well, and a wheel is used to extract brine.

It's even more difficult.

So although the technology is proficient, the amount of salt in Datang cannot be increased.

What you don’t know is that during the Tang Dynasty, that is, during the Zhenguan period of Li Shimin, there was no salt tax. Why is it that there is less salt? The court wanted to encourage people to make salt. Who would still make salt if you collect taxes?

Therefore, during the Zhenguan period, the operation of this salt was to make the people. After the salt was prepared, the government would collect it and then add some price to the merchants who held similar salt quotas, and then sell it to merchants who followed the merchants to sell it wherever they were.

This is a fact that the price of salt is not high, but it is rare. If you want to grab salt or a large amount of supply from the army, it is still a bit difficult for you to grab salt.

The salt eaten by the Li family is also the kind of large sea salt, although it is cheap and not delicious, but it is also difficult to buy.

"Zhan'er, do you still know how to make salt?" Li Dafu looked at Li Zhan in surprise.

Li Zhan looked at everyone's shocked look, but said lightly: "This is very simple. Where is it, it's just a small knowledge, and some children understand it."

"Wow!" Li Zhan's understatement made everyone present admire him.

"Zhan'er, why don't we make some salt tonight? Anyway, the salt at home is almost gone." Li Dafu asked with a smile.

"Okay!" Li Zhan nodded.

In this way, after dinner, Li Zhan began to prepare salt. In fact, it was very simple to make salt. First, the first step was to crush all the salt ores. After crushing them, put the crushed salt ores into a bucket and filter them to remove impurities from the salt ores.

Then put the salt water that removes impurities into the pot, steam it at high temperature, boil the water in the pot dry, and soon the crystals at the bottom of the pot will be edible salt.

From around 18 o'clock in the evening, I was busy until at night that Li Zhan's first pot of salt finally came out.

When the lid of the pot was opened, everyone was stunned because the salt in the pot was the best fine salt, Li Dafu shouted in surprise: "It is the best fine salt, I think it can be used to brush my teeth."

It was very simple to brush teeth in the Tang Dynasty. It was just dipped in salt to brush your fingers. The salt that can brush your teeth is definitely the best salt.

These salts are used for doors for royal families and nobles.

"If you sell this, you will at least be a pound!" Zhang Hei said happily.

However, at this time, Zhang Damao spoke out and stopped him: "Don't think about it all. The court prohibits selling private salt. We can keep it for food, but it must not be used for sale.

Otherwise, be careful I will break your legs.”

Although he was already very old, Zhang Damao's majesty was still there. When Zhang Damao scolded him, Zhang Hei and Zhang Shun immediately shrank his head.

At this time, Li Zhan smiled and came out to smooth things over, "Grandpa and uncle, just say that the salt has been made, so we will use it at our own home and not take it out."

Our main thing now is to make popsicles. The weather is getting hotter and hotter. We need to make preparations quickly so that we can make a big profit when the weather is hot."

"Okay!" Li Zhan's words made everyone nodded with a smile.

Salt making is just an episode. Li Zhan’s most important thing now is to make popsicles, which is the main business.
Chapter completed!