Time passed slowly, and when Li Yuan and the others arrived at Wujia Village, Chongwen Township, Jingyang County, it was already getting dusk.

There is a trickle of water at the west end of Wujia Village, about three steps wide, which leads from the northwest direction and flows through the tender green wheat fields.

According to the villagers, this is an artificial canal, called the Willow Canal, which existed as early as the pre-Qin period, and the people who built it were vaguely called Zheng Guo......

On the north bank of the willow canal, the terrain gradually rises, which is the closed mountain plateau.

Guanzhong people usually call the high slope below the mountain as a plateau, and the Chang'an Imperial Palace is built on the high slope, condescendingly, looking at the entire Chang'an City.

And that high slope, called Longshouyuan, is the boundary between Chang'an City in the Han Dynasty and Chang'an City in the Tang Dynasty. Legend has it that when Qin Mugong won Ren Hao to sleep in Yongcheng, he dreamed of a black dragon falling from the sky, winding north to the Wei River to drink water, his deeds turned into the dragon's head, because the west end abruptly rises from the Wei River, the momentum is like the dragon's head and gets its name, this place has always been regarded as the dragon vein in Guanzhong.

The kiln factory in Wujia Village is on the closed mountain plateau.

"Ying Wazi, why are you here, I heard that you are not going to be a maidservant in the family of a noble person in Chang'an? Why did you sneak back? If the government knows that he is going to be wanted......"

Wu Fubin is a simple old man, with gray hair, and the deep wrinkles on his forehead are squeezed together when he speaks, revealing his yellow rotten teeth.

He saw that the picture screen stepped into the house, and he was wearing a silk satin, and his appearance was recognizable, which was very different from the poor appearance of the original escape, and his face was strangely bright.

Therefore, he remembered what his sister-in-law said a few years ago, who was also the mother of the painting screen, when she visited her relatives, the girl was sold to a large family to become a maidservant girl and became a lowly citizen.

Thinking of this, he suddenly felt sad, two tears welled up in his eyes, and shouted to his daughter-in-law: "Sanniang, quickly clean up the house for Yingwazi...... You still don't recognize Yingwazi? It's a girl's ......"

The daughter-in-law, who was called Sanniang, nodded at the picture screen, smiled awkwardly a few times, walked into the house with a worn-out broom, and began to clean.

The painting screen was stunned for a moment, and wiped his eyes without leaving a trace. She was very moved in her heart, if a lowly person escaped, the person who took him in would have to sit together in Tang Lu.

She forced a smile on her face and said, "Uncle, Ying Wazi is no longer a lowly person, it is a ...... entered the palace as a female official and became a concubine next to the emperor.

And His Majesty, the crown prince and others are now outside the door, and my uncle should pack up with his family first and go out to meet ......"

Wu Fubin took a closer look at the picture screen in shock, only to find that the clothes she was wearing and the headdress she was wearing were each worth a lot.

He went to Chang'an City to see those big wives, and few of them were more expensive than the clothes of today's picture screens.

How can this be the possession of a servant girl?

"Uncle?" The picture screen reminded loudly that there were still Daojun and the prince waiting outside the door, and she couldn't delay inside for too long.

Wu Fubin's expression was a little complicated, with both joy and sadness. The joy is that Ying Wazi is not a lowly and has become a high-ranking harem concubine, and he does not have to worry about being afraid to hide her whereabouts, but it is sad that he has become the concubine of the emperor.

The Emperor!?

As soon as I heard it, he was an old man, perhaps much older than his age, and I am afraid that he may die in the harem in a few years......

Wu Fubin also burned funeral goods for Emperor Wen of Sui, and he also knew the location of the harem concubines, if they had children, it would be fine, if they didn't...... will be martyred for the emperor!

And the emperor is too much to think about......

"Oh! Okay, good, good, my uncle thinks too much about things, so the whole family comes out to see Your Majesty. Wu Fubin wiped his tears with the sleeves of his half-worn robe and said hurriedly.

About a quarter of an hour later.

"What? Your Majesty...... Do you want to participate in the firing of glass yourself? Wu Fubin's eyes widened, a little incredible.

"Firing glass is a lowly thing done by craftsmen like villains, Your Majesty, you are so expensive, why take the risk?"

In fact, the glass mentioned in ancient times included three things: one is a translucent jade, the other is a glaze made of silicic acid compounds of aluminum and sodium, and the third refers to glass.

In the Shang Dynasty, when firing ceramics or smelting bronze, the temperature inside the kiln could reach 1,100 degrees Celsius to 1,200 degrees Celsius. During the firing process, there are times when the firing process inadvertently produces lead-barium and silicate compounds, but this is lead-barium glass, which is different from Western soda-lime glass.

"The Biography of Mu Tianzi" contains: "The Son of Heaven climbed the mountain of quarrying and ordered the people to quarry and cast as tools. ”

This is the process of firing glass.

During the Qin and Han dynasties, firing glass has been known, like Wang Chong of the Eastern Han Dynasty in the book "On Balance", he said that in the middle of the fifth day of May, Yang Sui can be used to "refine five stones as a vessel".

However, the ancient Chinese glass was colorful and shining, but it was brittle and brittle, not resistant to high temperatures, and difficult to adapt to the environment of sudden cold and heat. During the Northern Wei Dynasty, the Dayue clan came to China and quarried stones in the capital to refine five-color glass, which once made Chinese glass cheap.

"Did Poor Dao say that he personally went into the kiln factory to fire?" Li Yuan glanced at Wu Fubin with a little displeasure.

He came to Wujia Village for pure glass, and the process of firing colored glass in the Tang Dynasty has matured.

However, it is almost impossible to make the same glass products from the kiln factory system.

Most of the ancient Chinese science and technology were empirical technologies, such as the four major inventions, and there was no systematic research, or little research on the reasons for such changes.

For example, the blue and white porcelain born in the Song Dynasty is that the collected "blue and white materials" are crushed into powder and then depicted on the porcelain embryo.

As for what mineral and stone produces what color, whether it is thick or light, it is usually controlled by the craftsman using experience.

This caused a problem, that is, the glaze refined by the kiln factory in the closed mountain is not only scarce, but also of uneven quality.

As for...... The manufacture of pure white glass has not yet been mastered by the current Tang Dynasty.

"And what does Your Majesty mean?" Wu Fubin trembled, cold sweat was covered on his forehead, and he asked cautiously.

Li Yuan glanced at Wu Fubin with a little dissatisfaction, and explained: "A few days ago, Taichang Temple paid tribute to a few glass ornaments, and Poor Dao thought it was very wonderful...... Later, I learned that this thing was made of ordinary sand, and I was a little surprised.

Loam soil is turned into pottery at high temperatures, and then refined at higher temperatures to make porcelain, a change that has aroused a lot of interest in Poor Dao.

The glaze was born out of the gravel, but it is exquisite in the jade, and its change is not comparable to the clay embryo ceramics.

Therefore, the poor road came to find out this time, let's call it ...... Study and learn from nature! ”

The firing method of glass is a trivial matter, and what Li Yuan has to do is to introduce new academic ideas, and the research spirit that has gradually disappeared since the disappearance of the hundred schools of thought.

First learn things, then learn!

PS: Gewu Zhizhi is interpreted as seeking truth from facts in Confucian classics, and in this article, the protagonist will gradually use Gewu and Zhizhi in the Confucian "Book of Rites" to realize the spirit of modern scientific research.