In the past, the cutting, punching and scar marks in the work marks were introduced, and the significance of the work marks and ornamentation in the identification was also introduced, and the relationship between the work marks and the leather shell was expounded.
From this chapter onwards, we will gradually move on to the topic of shells.
Some friends may ask why the leather shell stopped for so long after the work mark was written.
I'm going to say sorry here, but when I was about to write about it, I found that I had a lot of heart when I thought about it, but I didn't know where to start, so I stopped. After nearly half a year of in-depth study and comparison of specimens, I gradually felt the charm of the shell and had the idea of writing it down.
Gossip a little and get into the whole.
First of all, what exactly is the shell, how it is formed, and how to see it.
As far as I understand, the leather shell is the expression of the jade in the whole process of cutting, rough plasticity, ornamental processing, grinding, polishing and burial in the whole process of jade processing, which I understand as the leather shell. These traces have different thicknesses and different positions, which will form a variety of superpositions and cancellations, and then there will be some bumps and scratches in the process of use, and there will be some attachment and erosion in the burial process, forming a variety of surface manifestations that cannot be improved.
Understand what it is, how it is formed, and how exactly do you identify it?
The work mark is the basis, the use is influential, and the burial promotes change, which is so complicated.
Yes, it will be much more difficult to understand and identify the skin shell, but there is a very core context: reasonable.
How to understand this reasonableness?
To put it simply, phosgene, erosion, and polishing marks are in line with the performance of the current position of the jade itself, and in line with the logic of the processing and burial environment of the jade.
For example, it is easier for everyone to understand that the work is actually a logical problem, the work mark is the first appearance of the processing process, and the color is the appearance of the buried environment after completion, and there is a chronological order. If the work is broken, it proves that before the work, it is either new or modified. That's logical sound.
There is also a common plausibility problem, some larger plane spaces are significantly better than phosgene in the yin line or work marks, and the performance of the skin shell varies greatly. There is also a certain amount of rationality to this. Because the flat part is easier to polish, multiple times and different particle sizes of polishing and polishing will make the jade phosgene better, while in the yin line or ornamentation, because the space is too small, the tool and operation space are limited, and the phosgene is poor, and the characteristic performance of the work mark may have some residues. This is reasonable. On the contrary, there must be a suspicion that there is something wrong with this jade.
In fact, there are many similar reasonableness in the whole process of jade processing, use, and burial, such as performance differences caused by process errors, performance differences caused by location restrictions, and even differences caused by the mentality of craftsmen, etc., etc., so we must learn about work marks, processes, learn historical knowledge, and understand the processes and craftsman mentality of jade in different ages, different periods, and different tools.
In this way, we can find problems in the process of identification and provide support for basic capabilities.
In addition to the reasonableness mentioned above, the shell section summarizes two key words, the thickness and unevenness of the shell.
Thick and heavy is understood from the depth of the longitudinal direction, the initial cutting traces are large, coarse, coarse cloth grinding molding, then processing decoration, and finally grinding and polishing, and then use, step by step to make the jade surface smoother, phosgene brighter, modern polishing mirror light and the like are also from coarse to fine step by step polishing formation. Then, in ancient times, due to tool limitations, time costs, etc., it may lead to a part of the work marks of the previous cutting being ground and residual after polishing; or the scars and grinding marks of the decoration processing are residual in the subsequent polishing process; If it is worn out by the tool of the next step, it is offset, and there will be residue at the same time; Although some of the cutting traces have not been completely erased, they have been polished into fine light by subsequent polishing, although there are protrusions or grooves, but there are still some positions that are polished after polishing, and these concave and convex and fine light are superimposed to form the final processing effect. Coupled with artificial wear and use, and erosion after burial, it eventually forms the skin shell performance that we commonly see. Stratified according to this process, as follows:
1. The top layer, the newly unearthed pits and scratches;
2. A period of bumps and scratches;
3 Old toning;
4. Erosion, crystallization, etc., formed by burial in the soil.
5 Marks, bumps, and scratches before entering the soil.
6 Polishing marks remain.
7. Traces of grinding remain.
8. Traces of ornamentation processing remain.
9. Cutting or processing rough grinding residues.
The above may be on top of the pulp, if you can look for it layer by layer and put aside the traces of the previous layer when looking at the next layer, of course, not every piece of jade has so many layers, but try to separate the layers then it is easy to understand the so-called thickness of the shell.
Speaking of unevenness, unevenness is actually relatively easy to understand. In a large space or a large range, the performance of the leather shell in different positions is uneven and different in detail due to different positions, different decorations, different processing methods and external influencing factors; For example, the side is generally a cutting trace; For example, holes are traces of pipe drills or felt drills; For example, the ornament is a stone tool or grinding traces, although it will eventually be polished and polished, but the traces are inconsistent, if the opinion is that all positions of the jade are similar to the light, similar processing traces, then it will definitely make people feel uncomfortable. In a small range, small space, the unevenness of the shell mainly reflects the disorder of the jade sand or polishing materials, although the foundation is basically the same, but the grit or polishing tools may be disordered, especially the jade sand will be more obvious, after adding water to the free state of the jade sand, the craftsman gives the force is forward and downward, but the force of the jade sand and the jade is only downward, because it is not fixed, the forward may be irregular movement to change the position. Therefore, the traces that lead to polishing in a small area are also uneven.
The above are all simply illustrated first, with the logic of the review, we have a basic understanding, and we will gradually decompose it to refine the explanation.