Before leaving, Ma Chao didn't worry about political affairs at all. He has three masterminds, Jia Xu, Fa Zheng, and Yang Fu, and a famous general Pang De, and an ugly brother in secret. Even, the two major forces of Dongqiang and Shenbumen also rely on their arms. It is not a monstrous disaster like thunder that can hit the Ma family hard.

And the only source that can create this disaster is Chang'an. Ma Chao's entry into Chang'an as the head of the Ma family was a turmoil for the Ma family, and at the same time, it was also a turmoil for the Chang'an court. His trip to Chang'an is not so much a hostage to enter the court, but a necessary process for the development of the Ma family: only by turning the attention of the Chang'an court to Ma Chao alone, can the forces behind Ma Chao get a period of calm development.

Therefore, whether it is from the perspective of family hatred or national hatred, it is inevitable that Ma Chao will enter Chang'an.

Before he left, the most reassuring thing was actually the things that had changed because of him. For example, new crops, roasted tea technology, distilled liquor, steel filling method, improved papermaking, etc., fortunately, now these new things have been scaled up in Fufeng, and there are special people responsible for taking care of them, and Ma Chao is still relatively at ease.

But the only thing that he never forgot was whether the craftsmen in the arsenal could thoroughly master the salt purification technology......

Before leaving, Ma Chao deliberately called the three giants of the arsenal: Han Feng, Zheng Hun, and Pu Yuan to the front and demonstrated a handful of salt purification technology to them.

In fact, the salt purification technology is very simple, which is nothing more than a few steps: dissolution, filtration, detoxification, evaporation and crystallization......

In Ma Chao's view, this is a small process experiment, but for the three giants, this is another milestone technology. Especially Han Feng, who also knew the huge profits behind this salt purification, the fox fake tiger used Ma Chao's name to mobilize Ma Chao's two hundred personal guards to stand guard in the arsenal, and his tense appearance was like Ma Chao wanting to make gunpowder.

The arsenal has everything, Ma Chao commanded, hammers, iron drills, sieves for making salt, linen, charcoal, wooden barrels, iron pots, and even five hand-cranked stone mills. Ma Chao checked it again, and he needed a lot.

"Look, your master is now delicate and expensive, and it is a big deal to use it once." Ma Chao smiled and said, took a small hammer to carefully smash a few pieces of salt stone into small grains, called a guard, poured the salt powder into the stone mill eye, the guard shook the stone mill and turned it around, the brown salt powder slowly flowed out from the edge of the stone mill, Ma Chao put the salt powder into the wooden barrel, added water, stirred with a wooden stick, let the salt fully melt into the water, and said after the solution was saturated: "This is the first step, dissolve, smash the salt and pour it into the bucket." ”

Ma Chao then poured the solution into another wooden barrel covered with a double layer of linen, and after a while, the linen cloth was full of gray-black slag. When the burlap was removed, the solution in the bucket became brown, and the solution became lighter in color, but there were still many impurities, and four layers of linen cloth were covered on a wooden barrel, and after filtering the poop again, a light red solution was left. Ma Chao saw that the impurities had been filtered clean, and told the main points of the process: "This is called filtration, no matter how many times it is filtered, it must be filtered after the color of the solution changes to this light red." ”

At this time, it is still not possible to evaporate and purify, but should continue the stage of detoxification. Ma Chao took a huge funnel and instructed the guards to smash the charcoal, before the guards could do it, Han Feng, Pu Yuan, and Zheng Hun personally went on the field and smashed the charcoal first, Ma Chao wrapped the charcoal grains in four layers of linen and stuffed them into the funnel, squeezed them tightly, found a shelf, fixed the funnel on the shelf, poured the solution into the funnel, and after a while, the pale cyan solution slowly flowed out, and took a handful to taste it, not bad, only salty, no bitterness, although some salt was lost in the process, However, it is guaranteed that the boiled salt is absolutely edible.

"This process is the most critical part, although some salt may be lost during this period, but I hereby warn everyone, if anyone sells the salt without going through this step, don't blame the military law!" When he did this, Ma Chao's expression was extremely solemn. After all, this is a major event related to the health of the Ma family's shop and the entire Han people.

"My lord, what kind of charcoal is used here?" Han Feng also knew that this link was very important, and asked this very high-level question.

"Well, there is no charcoal in general, but it is best to use bamboo charcoal, the adsorption capacity of bamboo charcoal is stronger......" Ma Chao nodded, very satisfied with Han Feng's point-to-the-point question.

After that, Ma Chao ordered the guards to set up the iron pot and pour the solution into the pot to boil. But he was far away from the iron pot: hot...... It's easy to get some salt in this summer.

Watching the solution bubbling in the pot, Ma Chao was also apprehensive in his heart, after all, this knowledge was taught in junior high school chemistry. But whether it can be done or not is still a matter of opinion. After the water in the pot gradually evaporated, Ma Chao saw that the bottom of the pot left a thick layer of hard shell with a tinge of blue, removed the firewood, and broke off a piece from the pot and still said in his mouth: "Well, the pure salt tastes good......

Without waiting for Ma Chao's instructions, Zheng Hun and Pu Yuan had already broken off their nails and filled their mouths, although their salty faces were twitching, they were reluctant to vomit...... The rest of the guards saw Ma Chao's signal, rushed to the iron pot in a swarm, picked off a piece and put it in their mouths, a few guards were so salty that they shed tears, and they knelt down for Ma Chao one after another, shouting: "The lord is really a god!" ”

'God-man fart! Ma Chao disagreed: just now he estimated that the smashed salt cubes looked like ten catties, but in the end only about three catties of refined salt were boiled, which was too great.

However, Ma Chao also knows that this is inevitable: it is much better than the people who rely on luck to eat salt...... Besides, China has been under the country for thousands of years, until the population reached more than one billion in the later period, and it has not eaten up all the salt. Maybe I'll hit the beach by then, and at that time to make salt, it's not as much as you want to get?

Thinking of this, Ma Chao instructed Han Feng, Zheng Hun, and Pu Yuan: "The three of you, have recently put aside all the research and development at hand, and put all your efforts into the production of this salt purification tool, and after Meng He and Hanzhong reach an agreement, large-scale mass production will be carried out." As for the shipment, it is handed over to Meng Da, who has now fallen into the eyes of money, and it is definitely right! ”

"The lord is wise!" The three of them hugged their fists, and they were very convinced of Ma Chao's arrangement.

"By the way, bring these samples to Meng Da and let him set a price......" Ma Chao clapped his hands and said, "Are those things ready?" ”

"Don't worry, my lord, that glass happened to be blown yesterday, and it has been carefully packed into the box, and at your command, a lot of fur and linen shockproof ...... have been specially added" Han Feng knew what Ma Chao was asking, and stepped forward to answer.

"Well, yes, the Ma family has an arsenal, at least 100,000 troops!" Ma Chao was emotional: sure enough, science and technology are the first productive forces! No matter what the era, the most scarce is still ...... Talent!

"Those are just tinted glass, and after I come back from Chang'an, I will tell you how to make colorless glass." Ma Chao said that when he rode the elephant dragon horse and was about to rush back to his backyard, he seemed to remember something again, and advised: "Remember, the glass making method is the biggest secret of the Ma family, and you must keep it." In addition, don't produce too many glass products, just ten pieces a month......"

"No!" Seeing Ma Chao rushing away, Han Feng, Zheng Hun, and Pu Yuan were churning in their hearts: Could the lord really come down from the sky to this point, how could he get anything unbelievable?