Li Yuan's lunch was not eaten in the palace, and when he heard that there was a vegetarian meal, he readily agreed, and followed Qing Yu's footsteps to the side hall of the Xingyun Temple, where the main hall was dedicated to the gods of the heavens.

The vegetarian meal is very good, a bowl of vegetable noodles, and some cold wild vegetables.

Taoism respects the unity of heaven and man, so it has always liked to eat wild vegetables, and even the upper and lower classes of the Tang Dynasty also have a habit of eating wild vegetables, and the emperor did not eat less in the palace.

However, the dishes of the Imperial Palace are very good even if they are a plate of vegetarian dishes, while the dishes of the Taoist Temple are much lighter, the method is simple, and the taste is really a bit back to nature.

Li Yuan picked up the bowl, drank the soup of the vegetables and noodles, looked at Qing Yu and said: "Daoist Qing Yu, there is no other meaning to come here this time, just to ask you for help, some materials are difficult to find in the outside world, but in your Taoist temple..... It's easy to find......"

Although the speed of movable type printing is faster than that of engraving printing, how to make "movable type" is indeed a difficult problem, after Bi Sheng of the Song Dynasty invented movable type printing, he has used cement movable type and wooden movable type printing.

The cement movable type is made of cement into a blank with consistent specifications, engraved on one end of the anti-body single word, the height of the protrusion of the word is like the thickness of the edge of the copper coin, and it is hard to become a single cement movable type. In order to meet the needs of typesetting, there are several or even dozens of commonly used words in order to be used when repeated in the same edition. If you encounter an uncommon word, if you are not prepared in advance, you can use it as you go.

In order to facilitate the selection of words, the clay movable type is classified according to the rhyme and placed in the wooden lattice, and the paper strip is pasted to indicate it. When typesetting, a framed iron plate is used as the bottom support, and a layer of agent made of pine resin, wax and paper ash is coated on top, and then the required cement movable type is picked out and arranged into the frame one by one. Fill a frame to become a version, and then bake it with fire, wait for the agent to melt slightly, use a flat plate to flatten the literally, and after the medicine cools and solidifies, it becomes a version. When printing, as long as the ink is brushed on the plate, covered with paper, and a certain amount of pressure is added. In order to be able to print continuously, two iron plates are used, one version is brushed, the other is typeset, and the two plates are used alternately. After printing, the potion is roasted with fire, and the movable type can fall off the iron plate with a slight shake of the hand, and then put it back into the original wooden grid according to the rhyme, so as to be used again next time.

Later, Bi Sheng also experimented with movable type printing, but he did not use it because of the uneven texture of the wood, the difficulty of carving, the deformation of the movable type after being wetted with water, and the difficulty of separating it from the medicine.

For the emperor, what he had to do was not only movable type printing, but also the lead movable type printing press invented by Gutenberg, and what the lead movable type printing press needed was lead movable type, which is commonly known as "copper mold".

The copper mold needs to be mixed and fused with three metals: lead, antimony, and tin in proportion.

From the Shang Yin to the Han dynasties, the content of lead in bronzes showed a tendency to increase. The increase of lead in bronze plays an important role in improving the fluidity of liquid alloys, revealing the ornamentation of castings.

However, the distinction between lead and tin was not very clear in ancient times. The Romans called lead black lead and tin white lead. Alchemists have experimented with lead and some compounds of lead, for example, in Wei Boyang's book "Zhou Yi Shen Tong Qi": "When Hu powder is thrown into the fire, the color is still lead." In today's chemical equation, it is: Pb3O4 + 2C --→ 3Pb + 2CO2↑

Lead was indispensable in the smelting of bronzes, so it was easy to find, and the same is true of tin, which was widely used in ancient times to support furniture, and in the eighties and nineties, a large number of kettles were made of tin.

However, compared to the previous two, antimony is much more difficult to find, although China is the world's largest antimony storage country, containing 89% of antimony minerals.

However, it is still difficult to get pure antimony. According to the "Hanshu Food and Goods Chronicle", it is recorded: "Wang Mangju photographed, changed the Han system, and used copper to cast coins, and confused with tin. ”

The arrows of the Qin Dynasty unearthed in the Qin tomb contain antimony through spectral analysis, which shows that the use of antimony in China is very early, but it was not called antimony at that time, but called "Lianxi".

The Emperor Taishang came to the Nebula Temple today not only to eat a bowl of noodles, but also to find antimony in the Nebula Temple.

After all...... The Taoist priest of alchemy has the most various compounds here.

"It turned out to be a ...... to find materials" Qing Yu breathed a sigh of relief in his heart, refining the elixir for these emperors and generals is the most laborious, and accompanying the monarch is like accompanying the tiger, how can it be easy for the landlord to make money.

"What kind of elixir does Dao Jun want to refine, although Poor Dao's skills are low, he can still rank in the top three ...... in Chang'an" Qing Yu said with a smile.

In his opinion, the Emperor Taishang must have been looking for pills to refine pills, and he couldn't think of any other reason.

"I want to live longer." Li Yuan glanced at Qingyu, everyone is a Taoist priest, so there is no need to deceive yourself, most of those pills are poisonous pills, who will take them if no one tries them?

It's just that some awesome Taoist priests directly asked the emperor to test the medicine, which was simply dancing on the tip of the knife......

"Still alive? I'm afraid that the death will be a matter of the past year or two. Qing Yu secretly guessed in his heart that it would not be a few days before the Emperor Taishang came to the limit, but this had nothing to do with him.

He changed the topic and said with a smile: "Dao Jun, please, the alchemy room of the poor Dao is over there, and the Dan Dao Jun there can pick at will."

The group soon came to the alchemy room of the Nebula Temple.

In addition to a special alchemy furnace, the alchemy room is spacious, and in the cabinet against the wall, it is like a medicine cabinet in a pharmacy, where all kinds of "cherished" materials are placed.

"The Dan materials of the entire Chang'an are the most complete in terms of nebula." Qing Yu pointed to the materials and introduced.

Some materials are simply not available in the market, so you have to go to various places to find them.

Li Yuan nodded, and began to look for it, he was also an engineering dog in his previous life, although his major did not involve chemical engineering, but the compound of antimony still existed in his memory.

It didn't take long for him to find it in the medicine cabinet, which was somewhat similar to tin, but when he looked closely, it was different. He then used his knowledge of chemistry to begin purifying antimony.

After a full hour, Li Yuan finally prepared the three materials for making the copper mold of lead, antimony, and tin.

But this is still 108,000 miles away from the manufacture of lead movable type printing press, after the materials are complete, if you want to make a copper mold, you first need to use a clay mold, and then mix the three metal materials in proportion and pour them into the clay mold, and after grinding and polishing, you can obtain enough lead movable type to be used.

Of course, these things can be left to Niu Daren, and they only need to follow the drawings to complete these processes.

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