"There are people who do this!"

Liu Yiyan smiled: "But it is only for the top jadeite, but the top jadeite rough has a small amount and almost no cracks, and the amount of ordinary jadeite is large and cracked, so it is not cost-effective to use this fine way of taking materials." ”

It has to be said that jadeite is a magical thing.

The better the jadeite, the easier it is, and the worse the jadeite, the more troublesome.

The top jadeite, the density of the texture is very good, often a whole piece of rough stone can not find a crack, this kind of jadeite can not see a few pieces a year, naturally rarely use this fine way of reclaiming.

The ordinary jadeite, the number of cracks, the number is huge, with a fine way of picking, time-consuming and laborious, the value of the jade material taken out is sometimes not enough wages, and naturally will not use the fine way of picking.

Chen Song asked, "Master Liu, what kind of fissure is this based on to draw the tangent?"

Liu Yiyan replied: "According to the degree of damage to the rough stone by the crack, find out the place with the greatest impact on the whole rough stone and paint." ”

Yang Hao asked, "Is it to find the largest and deepest crack on the whole rough stone and draw a tangent line according to its trend?"

"A lot of people think that's the case, but it's not!"

Liu Yiyan shook his head and said, "The biggest and deepest crack on the rough stone is not necessarily the one that has the deepest impact. ”

Seeing that the two of them were still looking at him with a puzzled expression, Liu Yiyan asked: "If there is a big crack on half of the rough stone, but the other half is not, how do you think the tangent line should be drawn?"

Yang Hao replied: "Directly on the big crack, draw according to its extension direction." ”

"Not bad!"

Liu Yiyan nodded and continued to ask, "What if there is a dense crack in this half of the rough stone that is cracked, but the other half has no crack?"

Yang Hao thought for a moment and replied: "Draw a T-shaped tangent line directly at the end of the extension of the big crack, and after the incision, you can split the cracked and the uncracked into two......

As he spoke, he suddenly came to his senses.

"Got it now, right?"

Liu looked at the two with a smile.

Chen Song and Yang Hao nodded repeatedly.

Liu Yiyan warned: "Big cracks are often misleading, must not be sloppy, many of the places that have the greatest impact on the original stone are not necessarily the places with the largest cracks on the top, draw any tangent line to find the right position, each tangent line must be the most suitable position for the material, because it can only be cut again and again, you must cut it to see clearly before you can draw the tangent line again, don't draw it conveniently, draw several tangent lines at the same time!"

Yang Hao asked, "Master, is this hidden crack the key to determining the tangent position?"

"Yes!"

Liu Yiyan smiled: "Only by identifying the cracks on the original stone can we truly understand the cracks on the original stone, otherwise everything will be in vain." ”

"The fissures on the weathered crust of the rough are very simple to classify, that is, according to the hidden fissures. ”

Liu Yan squatted down in front of a rough stone in front of him, pointed to the grooves of different depths on it, and said: "Like this one, there are various grooves of different depths on the rough stone, which is a trench-style crack, and along the direction of the groove, there are often various cracks of different sizes formed inside. ”

Chen Song and Yang Hao hurriedly stepped forward and squatted down and watched carefully.

I was secretly surprised to find that the cracks on the weathered crust of the rough stone were only recessed, and there were no obvious cracks.

Unexpectedly, there would be a large number of fissures hidden under this tight trench on the surface.

Yang Hao pointed to a piece of rough stone next to him with a crack like a ladder on it, and asked, "Master, is this piece a step-type crack?"

"Yes, this size is different, it looks like a step type is called a step type of crack, the appearance of this step looks obvious, but more of the rough stone is not obvious, and the top is prone to cracks along both horizontal or vertical directions of the step. ”

Liu Yiyan stretched out his hand and pointed to a vertical place.

There are several cracks on it, as if they were created by squeezing between the upper and lower steps.

Chen Song asked, "Master Liu, how did it come about?"

Liu Yiyan replied: "This kind of crack margin is different from the upper and lower stress release, and the texture density is different, it looks like a stepped type, but in fact, the cracks on the weathered crust are caused by the action of force between its internal structures." ”

After speaking, he pointed to a rough stone that looked like several slopes, and said: "The cracks on this rough stone are also obvious, which means that the slopes of different angles above it are intertwined with each other, and the forces in different directions between the surfaces act together at the same time, resulting in cracks in the same direction as the slope at the intersection, and it is very messy." ”

Yang Hao looked at the slope on the rough stone and asked, "Master, is this called slope cracking?"

Liu Yiyan shook his head and said: "No, the crack in it is generated by the collision of several faces, and it is a messy interlacing, so it is called a staggered crack." This name is first based on the internal fissures that will occur, and if the internal fissures are complex and changeable, it will be named after the weathered crust cracks. ”

Chen Song and Yang Hao nodded in understanding.

I have to say the importance of the name, it can simplify the name of the same thing and at the same time make people have a very intuitive impression.

Although the name of the crack on the weathered crust is more complex than that of other species, it is still easy to remember, and the name directly represents the hidden crack on the rough stone, although it is not as clear as other species, but it also knows which direction to distinguish.

Yang Hao pointed to a piece of rough stone next to him that was faintly concave and stretched, and asked, "What kind of crack is on this rough stone?"

Chen Song took a closer look at the rough stone that Yang Hao pointed to and found that except for a large slightly concave groove on it, there was no cracking in other places.

Liu Yiyan said: "This is a total fracture, don't look at its weathering shell has no cracks, but there is a very serious fracture inside, which is caused by the jadeite crystal has not been completely separated, so its seed water is very poor, in addition, the destruction of the full fracture is restricted by the direction, will not be disorganized, as long as you find the direction of the crack, you can directly draw a tangent." ”

"There are several kinds of cracks in the rough that you should be very aware of. ”

Liu Yiyan said as he walked around to the side and squatted down in front of a few rough stones that were placed alone.

Pointing to a piece of weathered shell is very rough, there are parallel cracks on the rough stone, said: "This kind of parallel crack is more common on the jadeite wool, this kind of rough skin, the groove is parallel lines of the jadeite wool inside the cracks must be many, even if the artificial cover can still see the traces of cracks, you look at this place, see what can be found......"

Liu Yan pointed his finger at a darker place on the weathered shell.

"Why does this place look a little black? It can't be a good place to grow water, right?"

Chen Song and Yang Hao couldn't help frowning deeply.

Liu Yiyan shook his head and smiled: "Where is the water good? This is a crack in the sky that has been disconnected, so it looks black." ”

Chen Song and Yang Hao suddenly couldn't cry or laugh.

It's been a long day, and this black is cracked!

"This crack should be paid special attention. ”

Liu glanced at a rough stone full of small cracks on the surface weathered shell, and said: "This is a fine crack, which is usually radioactively cracked, many people think that such a jade rough stone is a kind of rough stone with a block of abnormality, even if it is me, I need to be extremely cautious when I encounter it!"

Chen Song and Yang Hao looked at the rough stone in amazement, quickly remembering the characteristics of the weathered shell and the cracks on it.

Even Liu Yanyan, who is a top phase jade master, needs to be extremely cautious, it seems that this kind of crack on the rough stone is very complicated.

After both of them remembered, Liu Yiyan pointed to a rough stone next to him and said: "This is a curved fracture, this crack is a headache for all Xiangyu masters, it will form a kind of unordered, different sizes of cracks, it is very difficult to judge!"

Chen Song smiled bitterly: "It's really impossible to start with such a crack!"

Even if the weathered shell on the rough stone is twisted and bent, it is still intermittent, and this look shows that the cracks inside are messy and irregular.

Liu Yiyan said with a smile: "Generally, where there are cracks in the rough stone, there will be performance on the weathered shell of the rough stone, and there will be ravines or cracks that can be seen by the naked eye, but in fact it is not as imagined. ”

Yang Hao, Chen Song, and Yang Hao nodded understandingly.

The deeper you come into contact with jadeite, the more you can appreciate the magic of jadeite!

During this time, every afternoon they were looking for cracks in the material, and they knew the importance of cracks and how difficult it was to identify.

I even doubted my eyes and judgment for a while, and many times what I saw was completely opposite to the real situation!

"Master, are these two pieces also very difficult to distinguish the type of crack?"

Yang Hao looked at the remaining two pieces of this small pile of rough stones and asked.

"Almost!"

Liu Yiyan pointed to one of the remaining rough stones, and said: "The criss-crossing cracks on this rough stone are vertical and horizontal cracks, and the criss-crossing cracks on it are the most hated fracture method of Xiangyu Master, so they alternate with each other, and the fracture marks of different lengths are too destructive to the rough stone, which is very annoying!"

"Master Liu, what about the last black rough stone?"

Chen Song found that the last black rough stone was very complete, and there were no cracks on the weathered shell, so he really couldn't see anything wrong.

"The material of this black weathered shell is relatively special, because the weathered shell is black, its light transmittance is relatively weak, so the cracks on it are relatively difficult to find, this must first distinguish its texture and then judge the cracks, many jade merchants who do not distinguish the texture of the original stone, often use to distinguish what field it belongs to to infer its internal cracks. ”

Liu Yiyan suddenly praised: "This road leads to Rome, the rough stone of different fields, because of the different natural geological environment, resulting in different textures of the original stones, recognizing the entrance can undoubtedly roughly know the texture of the situation, in the case of not being able to accurately distinguish its texture, it is a good way for them to recognize the field!"

Chen Song and Yang Hao's eyes lit up.

It's much easier to distinguish the field than the texture!

As long as you remember the characteristics of the rough stone one-to-one correspondence, you can know the field mouth, but the texture needs to carefully identify the crystal conditions on the weathered crust of the rough stone.

As if seeing what the two of them were thinking, Liu Yiyan said: "If you want to become a Xiangyu master, don't think about this method!"

"Why?"

Chen Song and Yang Hao looked at Liu with puzzled expressions.

Such a good shortcut, but Xiangyu Master can't use it?