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Chapter 689 Treasure Appraisal Activity (7)

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    In fact, comparing the unearthed Han Dynasty bronze calipers with modern vernier calipers, except for a certain gap in measurement accuracy and the length of the calipers being shorter than modern ones, their principles, performance, uses and structures are very similar to modern vernier calipers.  It is used for measuring and processing cylinders, spheres and irregular objects.

    It is not difficult to see from this that the Han Dynasty copper calipers unearthed in my country are the original vernier calipers.  In addition, the National Museum and the Beijing Art Museum each collect a new Mang copper caliper from the Wang Mang period. They have measurement scales and chronological inscriptions. Both are slightly longer than the copper calipers unearthed in Yangzhou, and the claws are slightly shorter.  Their appearance, structure and combination are basically the same.

    Therefore, if you encounter a bronze caliper in the future, don¡¯t take it for granted that it is a figment of modern people. You may miss a rare antique because of this.

    However, this kind of bronze caliper is rare after all. Many people have never heard of it, let alone seen it. Therefore, Meng Zitao was also curious about it and looked at the caliper in the middle-aged man's hand.

    At this time, I heard Teacher Sun say with some helplessness: "Old Xue, I have told you so many times that this kind of caliper is rarely unearthed and is not sold in the market at all. Why don't you listen?"

    Old Xue's name was Xue Weiyong, and he was a senior collector who mainly collected various bronzes, especially rare bronzes. According to what Teacher Sun later told Meng Zitao, he had spent at least hundreds of thousands on the bronze calipers.  The money was wasted.

    Xue Weiyong said with a smile: "Teacher Sun, this is different, you will know after you look at it."

    At this point, he approached Teacher Sun and said quietly: "I saw this dug out from the ground, there must be nothing wrong with it."

    Teacher Sun shook his head secretly, not wanting to say anything more, so he took the caliper and looked at it. After a while, he gave the caliper to Meng Zitao.

    Meng Zitao took it and took a look. There should be nothing wrong with the shape of the caliper. But when he looked at the production process, it became a big problem. There was no need to look at details such as patina.

    "Old Xue, sometimes, seeing is not necessarily believing." Teacher Sun said the result tactfully.

    Xue Weiyong was shocked: "What, it's wrong again?! It shouldn't be. Look at this patina, how natural it is. How could it be fake?"

    Teacher Sun said: "Nowadays, science and technology are advanced, and various methods of fraud are emerging one after another. It is normal for your patina to look fake, but if nothing else, the welding technology on your caliper is wrong. How can it be real?"

    Xue Weiyong said in surprise: "This is brazing. I remember that brazing was invented during the Warring States Period. Why is it wrong?"

    The ancient welding technology in my country was invented around the late Western Zhou Dynasty and was widely used during the Warring States Period.  From the perspective of solder composition, it can be roughly divided into three types: lead soldering, copper soldering, and silver soldering.  Before the Spring and Autumn Period, lead-tin soldering was mainly used. Copper soldering was invented in the early Warring States Period, and records of silver soldering first appeared in the Ming Dynasty.

    Teacher Sun said: "You are right, but according to the actual object, it is more likely to be amalgam welding, and yours is high-temperature spot welding."

    Xue Weiyong retorted: "No, the records of amalgam welding are very late. I remember that there were no relevant records until the Ming Dynasty."

    Teacher Sun said: "The relevant records are relatively late, but its invention is not too late. As early as the pre-Qin period, my country has widely used the amalgam tin plating method, and the process of amalgam welding is not much different from it. . The bronze solder produced at Jundushan in the capital is thicker and smoother, so it is possible to use pour welding or amalgam welding."

    "I think there is also a problem with solder. Since the records of 'welding' in the Han Dynasty are relatively simple, it should generally continue the previous technological development."

    Meng Zitao talked eloquently: "The late Spring and Autumn Period to the late Warring States Period was the mature stage of the development of brazing technology. It was mainly reflected in the improvement of solder materials. Among them, the solder used in the bronzes unearthed from the tomb of Zhao Qing in the Jin Dynasty and the tomb of Zeng Hou Yi in the early Warring States Period was  The material is already a lead-tin alloy. Among them, the Zunpan unearthed from the tomb of Zeng Houyi used a lot of brazing technology during its manufacture, and the brazing material was a lead-tin alloy. I think that by the Eastern Han Dynasty, the brazing material should not have changed much.  "

    Seeing that Xue Weiyong wanted to refute but couldn't find a reason, Teacher Sun continued: "Okay, let's not talk about the solder joints, let's talk about the patina. You said you saw the things unearthed with your own eyes, then I  Let me ask you, are the other things unearthed also from the Han Dynasty?"

    "Yes, it's from the Han Dynasty." Xue Weiyong nodded, vaguely feeling that something was wrong.

    "I believe you should have noticed it now. From the Han Dynasty to the present, whether it is a dry pit or a wet pit, do you think it will be this rusty color? It is obviously wrong."

    &We are somewhat responsible here and I am very sorry for causing you trouble.  If it's convenient, please come to the hotel we booked to dine. It's also considered as our apology to you two.  "

    Thinking that there was nothing going on at noon today, and that Meng Zitao was planning to come over for a visit in the afternoon, plus the warm invitation from the person in charge, Meng Zitao and Feng Zhengsheng agreed.

    The location of the hotel is not far away, and the environment is beautiful, which is very suitable for the status of experts.

    When the person in charge arrived with Meng Zitao and the others, the experts were already seated. Several of them recognized Meng Zitao and greeted him immediately. However, the experts who did not recognize Meng Zitao also asked after asking.  They all came to mind.

    No matter what the inner impression of Meng Zitao is, at least on the surface, everyone's attitude is very enthusiastic. This is partly because Meng Zitao is a close disciple of Zheng Anzhi, and more importantly, because of Meng Zitao's superb calligraphy skills.

    After a while of greetings, everyone took their seats. A total of more than a dozen experts were divided into two tables. Meng Zitao and Feng Zhengsheng were placed at the table of highly respected experts, and everyone had no objections.

    Next, everyone exchanged glasses. Because they had to appraise treasures in the afternoon, everyone did not drink but drank juice instead, but the atmosphere was still very lively.

    Those present are all well-known experts in the industry, the youngest of whom are in their fifties or sixties. Of course, the conversation at the dinner table cannot be separated from the topic of antiques.

    As the youngest person present, Meng Zitao has a high status, and everyone's attention is also on him. After a while, everyone was more or less surprised. It is true that Meng Zitao is too knowledgeable and can understand every topic.  Good to talk to and very knowledgeable.

    By this time, while everyone was amazed and admired, they were also a little jealous of Zheng Anzhi. Who wouldn¡¯t want a good disciple? It would be great if Meng Zitao could become their disciple.

    After the meal, everyone went to the lounge prepared by the organizer to take a rest. An old man who specialized in porcelain pulled Meng Zitao to sit down next to him, then took out a jade pot spring vase and said: "Little  Friend, could you help me take a look at this sweet white glaze?"

    Meng Zitao was a little surprised when he saw this jade pot spring vase. The vase had its mouth curled, its neck tied, its shoulders dropped, its belly hanging down, and its feet circled.  The whole body is decorated with sweet white glaze and dark floral patterns.  The neck is engraved with a curly grass pattern and a wishful cloud head, and the abdomen is engraved with a broken branch pomegranate pattern. The branches are stretched, the flowers and fruits are beautiful, the pomegranate is ripe and cracked, and the lower part is lined with a Ganoderma lucidum pattern.  The foot is decorated with a ring of swastika patterns.

    He took the jade pot spring vase into his hand and asked, "Is this Yongle sweet white glaze?"

    Gao Lao was a little excited when he heard this: "Yes, I think it is Yongle sweet white glaze, but I am a little unsure."

    Sweet white glazed porcelain is a kind of pure white glazed porcelain created and fired by the imperial kiln factory of the Yongle Dynasty in the Ming Dynasty.  In layman's terms, a white opalescent glaze containing no iron or very low iron content is applied on an extremely thin carcass, and then baked at high temperature to restore an extremely white and shiny glaze color, giving people a "sweet" look.  It means sweetness and purity, so it is called sweet white glazed porcelain.

    More than 90% of the porcelain unearthed from the Yongle deposits in Zhushan, the porcelain capital, were white-glazed wares. However, no white-glazed jade pots and spring vases have been found yet. However, there are several examples of blue and white jade pots and spring vases. This also shows that Yongle white-glazed jade vases  Huchun vases are very rare, and among the Yongle white-glazed jade Huchun vases that have been handed down from generation to generation, there are even fewer examples of secretly engraved durian-opening Baizi patterns.

    If this is a genuine item, it would be worth at least tens of millions.

    Meng Zitao was particularly interested in such an important weapon. Out of habit, he did not use his powers at first and carefully observed every detail of this jade pot and spring vase.

    Yongle Sweet White Ware was created and developed on the basis of Privy Porcelain.  In the tire refining, the proportion of kaolin is increased, and the impurities are removed through multi-layer filtration and panning, which strengthens the toughness of the tire body and makes the blank thinner and finer white. At the same time, the aluminum component is increased to increase the firing temperature. Most of the  Yongle Sweet White Ware is in a semi-born state.

    As for the compatibility of the glaze, after removing the iron component, the glaze color is bright white with a slight beige color, and there is a lake green phenomenon in the glaze accumulation.  Therefore, the whiter the Yongle sweet white glaze is not, the better. Its whiteness has a certain degree. If it is too high or too low, it cannot be considered a treasure.

    (1662) (Remember the website address: www.hlnovel.com
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