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Characteristics of agate in Western Zhou Dynasty
It is hexagonal or octagonal in shape, bright red, with large channels, light intensity of water, bright red and transparent appearance, forming glass ooze.

Jewelry industry is commonly known as Sima.

Compared with the Eastern Zhou Dynasty, the Western Zhou Dynasty is divided into the Spring and Autumn Period and the Warring States Period. The Western Zhou Dynasty refers to a historical period. Of course, the definition of Xima does not necessarily belong to the Western Zhou Dynasty, and it is consistent, because the agate of that period has indisputable and remarkable characteristics.

There are four obvious differences between the Western Zhou agate and the new agate:

1. Let's talk about the all-encompassing feeling formed after agate is processed into beads. This is a very subtle feeling. It can only be found after countless comparisons between the old and the new. This was determined by the backwardness of processing technology and tools at that time. At that time, people wanted to process an agate stone into agate beads by subtraction. It is to hammer it with backward tools to make it close to the shape that the craftsman wants, and then polish it as much as possible. Therefore, there will be traces of poor connection on the surface of agate beads, which are not as smooth and flat as those processed by modern tools, but counterfeiters often deliberately leave this defect, so the imitation does not handle this defect very well, which is not easy to judge. It takes a long time to compare before we can really find the subtle difference between true and false.

2. Secondly, talk about Sima's tunnel. Sima's tunnel has strong water light. Observing its inner wall under the light, there is a feeling that the water surface shines in the sun, which is also determined by its drilling technology, which is beyond the reach of counterfeiters. At that time, because the tools used for drilling were all manual rotation, there were no electric tools, so the spiral formed on the inner wall of the hole was irregular, with thick and thin, deep and shallow. If electric tools are used to drill holes, the spiral line formed on the inner wall of the hole is uniform and fine, and the inner wall is not worn. The process of drilling old beads is actually the process of planing holes, and then it is naturally polished after long-term wear with ropes. Then some people will ask, wouldn't it be stupid if imitators restore ancient drilling technology? In that case, the cost is too high, and it has never been done before, so it is not worth the loss. What counterfeiters pursue is profit, not profit maximization.

3. Furthermore, the polishing technology of the old bead surface has the characteristics of each era. If it unfolds, it's a long story. I won't go into details here. As far as the agate of the Western Zhou Dynasty is concerned, it is quite smooth in all aspects. To put it bluntly, it means smoothness or water. This is also a concrete manifestation that the ancients were more calm than today.

4. talk about cow hair patterns. Cow hair pattern is actually an image metaphor, that is, the wear marks on the surface of old beads over the years, but it is also related to the material of the beads. Hard grinding marks must be small, but the cow hair lines formed on the surface of the old beads must be chaotic and distinct.

Finally, let me talk about Sima's sense of qualitative change, which is the key to his life and death. If he fails, he can basically be shot. This sense of qualitative change is not easy to express in words, and it is abstract because it is a sensory feeling. I summed it up and called it hard plastic texture. The real Sima gives people the impression that it is dyed hard plastic without dazzling light. Its beauty and brilliance were restrained after thousands of years.