To make glassware, in fact, both raw materials and kilns can be overcome.

The real difficulty lies in the three key processes - temperature, blowing and annealing.

The temperature determines the transparency and clarity of the glassware, blowing determines the appearance of the glassware, and annealing determines the practicality of the glassware after it is made.

None of the three is missing.

You can try the temperature, but at most you can use the exhaustive method. As long as you spend time, manpower and material resources, you can always try it out.

But there is no place to learn the blowing technique.

It’s not that there are no people who know how to blow, but that there are too few that are difficult to find.

Because there are almost no one in the Tang Dynasty who blows glass.

Glass products were actually found in China as early as the Han Dynasty. However, later the Han Dynasty pacified the Huns and strengthened exchanges with the Western Regions. During the Wei, Jin, Southern and Northern Dynasties, due to frequent regime changes, long-term feudal separatism and continuous wars, the development of Chinese culture during this period was particularly severely affected. Persia, Greece and other Central Asian and European cultures also made the first large-scale entry into China during this period. With the introduction of these foreign cultures, Western glassware was imported into China in large quantities. This glass is more transparent and smooth, and can be made large and thin. The key is that its hardness is much higher than that of glass made by local crafts, so local glass was replaced.

Later in the Song Dynasty, a man named Cheng Dachang wrote a book called "Yan Fanlu", which mentioned it - "However, China casts something different from the Western Regions. When it is cast in China, its color is very bright and its quality is light and crisp, and it is fertile with hot wine and it breaks it at will; when it comes to the Haibo, it is simple and dull, and its color is also slightly dark. Even if it is boiling soup, it is the same as magnetic silver, and it is not damaged. It is called Fan Glazed Glazed."

It means that the local glass is bright in color, but extremely fragile. "Wo is hot wine, it breaks at will." If you pour a cup of hot wine, it will break and you can hold it at will. This strength is not practical at all.

Although Western glass is not as glossy and beautiful as local glass in terms of color and appearance, "although it is poured into a hundred boiling soup, it is no different from magnetic silver, and it does not damage it", its practicality is far beyond local glass, so local glass is eliminated.

Local glass cannot be used when making it, and the glass brought by Hu Shang cannot be used, so naturally no one can use the local technology of making glass.

This was the result of the Song people's research, but before that, the local technology of firing glass had been lost, and naturally, there were very few people who knew how to blow, or even nothing.

However, although there were no people who made glass, there were those in the Tang Dynasty, but in the past, there were those in Persia. Because most glassware was produced by the Qin Dynasty and Persia, and then brought to the Tang Dynasty by the Hu Shang. Although Persia had destroyed its country, the Dashi had Persia, and the Arabs would not give up on this violent business.

Therefore, those who wandered among the Hu merchants in the Tang Dynasty, the Great Food, and even the Qin Dynasty, especially those who sell glassware, must know the technique of blowing, or know where to know the technique of blowing.

These Hu merchants can do anything as long as they have enough benefits. Therefore, they can definitely get people who know how to blow.

Of course, this is the purpose of Wei Renshi coming to Li Chun.

With Wei Renshi himself, he has not yet been able to find someone who knows how to blow. However, if Li Chun spent some time on this matter - even without having to spend some time, just a matter of explanation - he would definitely be able to find it.

As for annealing, the reason why local glassware was not practical in ancient times was that there was no annealing process.

During the forming process of glass, due to the characteristics of the glass liquid, there will always be a certain temperature difference between the inner and outer layers of the glass. This temperature difference forms corresponding stress in the glass products.

Due to the presence of local, uneven stresses, the strength of the product is weakened.

The purpose of annealing is to reduce the stress in the product to a tolerance level, which can greatly improve the strength of the glass.

The blown glassware is placed in an annealing kiln for a long enough time to cool down through the annealing temperature range or at a slow speed. After this process, the glassware will not experience such a situation of "heat wine and cracking at will".

If the glass made can have the color of local glass and look shiny and beautiful, and it can also have the practicality of Western glass, you will not have to worry about not being able to sell it.

In addition, the raw material used for burning glassware in the West is natural quartz. It is quite a lot of it, and it is not easy to mine. Therefore, glassware from Dashi is very expensive and is sold in its local area.

However, Wei Renshi knew that the silica content in the river sand is very rich, so he can use river sand as raw material. The cost of river sand is low, so after making glassware, the price will naturally be lower.

It is practical, shiny and beautiful, and it is cheap, so you don’t have to worry about not being able to sell it to the Western Regions and Dashi, and Daqin.

No matter how you calculate this business, you will make a profit without losing money.

Wei Renshi did not hide it from Li Chun and told him what he knew.

Wei Renshi knew that Li Chun would definitely return to Li Shi. After Li Shi learned about this, if he understood the huge profit, Wei Renshi would definitely let Wei Renshi take charge of the matter. In this way, Wei Renshi would no longer be arranged in the fifth prison.

If you want Li Shi to be sure that he can really accomplish this, of course you have to explain the matter more clearly. Only by borrowing Li Chun to pass on this information to Li Shi and let Li Shi change his mind.

"Hesha?" Li Chun looked at the glassware inside the wooden box in surprise, with a strange expression on his face. It seemed that he could not connect the transparent and beautiful glassware in front of him with the fine sand at the bottom of the river.

Wei Renshi nodded: "Yes, the raw material is river sand. My fief is on the edge of the Wei River, and the number of river sands in the Wei River is unclear. The more Prince Chun can find someone who knows how to blow, we can set up a kiln by the Wei River, dig sand directly from the Wei River, and then fire glassware in the kiln. The most important thing at the moment is that Prince Chun can find someone who knows how to blow earlier."

Li Chun licked his mouth and asked again, "If Brother Renshi'er's method, how much would it cost to use this set of glassware?"

Wei Renshi looked at the set of glassware in the wooden box and smiled and said, "There is no specific number at the moment. But if you count too much, it will not exceed 500 jin at most. In fact, I think if the cost will drop further after getting on the right track, it will probably only cost dozens of jin to death."

Li Chun's throat moved significantly.
Chapter completed!