The glaze color of ancient porcelain is affected by many factors.
For example, colorant, flux, firing temperature, firing time, chemical atmosphere in the kiln, thickness of glaze, trace elements in glaze, thickness of glaze layer, glazing process, proportion of glaze formula and porcelain body
Color.
If you see a seemingly standard Ru kiln porcelain, then among the series of factors that give an impression of glaze color, it should be very well made.
In other words, Chen Wenzhe can now learn the formulas of colorants and fluxes through this piece of porcelain.
Through this piece of porcelain, you can retroactively see the firing temperature, firing time, and even the chemical atmosphere in the kiln.
If you study more deeply, through the production of this porcelain, you can know the thickness of the glaze, the trace elements in the glaze and other details.
In the glazing process, you can appreciate the thickness of the glaze layer and the exquisiteness of the glazing process.
Finally, there is the ratio of the glaze formula and the color of the porcelain body. You can see how it is made.
This series of details are all techniques, secret recipes, and even eternal mysteries.
Being able to learn any of them is a great gain, let alone learning them all.
And this is just one of the techniques used in making Ru kiln porcelain.
There are many factors that affect glaze color. For example, in the same glaze color, the glaze color with thick glaze layer is relatively dark, and vice versa.
If the thickness of the glaze layer is different, some glaze colors will undergo qualitative changes.
For example, Lang kiln red glaze porcelain generally has an almost white glaze on the rim. This is one of the characteristics of Lang kiln red glaze. This is because the glaze will flow at high temperatures and the glaze on the rim is thin. Because the copper red
The glaze layer of the glaze must reach a certain thickness to form a red layer in the middle of the glaze layer.
Also, the different chemical atmospheres in the kiln lead to different glaze colors.
Take the official kiln porcelain of the Southern Song Dynasty as an example. Although they all have lime-alkali glazes, and the glaze is as moist as jade, the glaze fired in an oxidizing atmosphere is cyan, and the glaze fired in a reducing atmosphere is beige.
In addition to the above, one of the biggest features of the glaze color of Ru kiln is the use of agate in the glaze.
The most representative glaze color is azure. If we compare the glaze colors of Ru kilns, the azure glaze color is the most precious, the pink cyan glaze color is second, and the sky blue glaze color is the most precious.
Ru kiln, in the Song Dynasty, the Dingzhou white porcelain had awns and was unusable, so Ruzhou was ordered to build a green porcelain kiln.
The chipped agate is glaze, as deep as agate, slightly yellowish, like egg white, what is called light blue, and the juice is as thick as fat.
Before the Song Dynasty, the Ru kilns of the Tang Dynasty were already able to produce relatively high-quality Ru kiln celadon. After that, the firing process became more developed, and the azure glaze color of the celadon was purer, until the pure azure glaze was used.
Fire it out.
When Chen Wenzhe observed the glaze color of Ru kiln porcelain, he found that the glaze thickness was different, and the glaze color expression was also different. The thicker glaze color would be better.
He knew that the successful firing of Ruguan kiln porcelain requires two firings, so its glaze colors will be more diverse.
Where the glaze surface of Ru kiln is thick, the glaze color appears thick and jade-like, while where the glaze surface of Ru kiln is thin, it appears translucent and has a strong opalescence.
The glaze of the Ru kiln porcelain that was fired for palace use is basically agate. After the agate is glazed, special crystals will appear on the glaze. The glaze is like gelatin, and the surface has the texture of jade.
The glaze, glaze layer, glaze color, and enamel are obviously all fine, and the resulting slices are also perfect.
Therefore, the more careful the appraisal, the more cautious Chen Wenzhe becomes.
Porcelain of this grade is worth more than a piece of national treasure bronze.
Of course, its research value, cultural value, and historical value are not necessarily higher than any piece of bronze.
However, purely compared to the market value, any opinion among the Ru kiln porcelain of the Northern Song Dynasty is a national treasure.
Gu Yi
Seeing now, Chen Wenzhe has a general idea. If there are no flaws in other aspects, the harvest this time will be great!
Holding back the excitement in his heart, Chen Wenzhe, as a professional appraiser, once again calmed down and conducted a careful appraisal.
The glaze is fine, but what about the tire?
When looking at the tire, you should first look at the bottom, or in other words, when looking at the porcelain, you should first look at the bottom.
I didn't look at it before, mainly because it was unnecessary, because the glaze in the first step of high imitation Ru kiln porcelain is not good, so there is no need to bother looking at other things.
The bottom characteristics of Ru kiln porcelain are also very obvious. Judging from the number and proportion of Ru kiln, most of Ru kiln porcelain has a flat bottom.
Ru kiln porcelain has a variety of shapes, but they all have flat bottoms. Flat bottom is one of the main bottom shapes of Ru porcelain.
The practical function of Ru kiln porcelain determines that its bottoms are mainly flat.
At the same time, the traces of the support nails on the bottom of the Ru kiln are very small, about the size of sesame seeds. These are called sesame nail marks. There is no standard for this kind of sesame nail marks. It is mainly judged based on experience.
If there is no problem with the bottom, then by exposing the bottom, you can see that the color of the porcelain is delicate, because the soil contains a small amount of copper. When you look at it under the sun, you will see a slight redness and a slight light color.
Yellow, this is commonly known as "Xianghui Ru porcelain".
Of course, among the Ru kiln porcelain handed down from generation to generation, some inner tubes are gray-white, slightly whiter than other Ru kilns. This is also an important feature of the official kilns of the Northern Song Dynasty.
The glaze color of Ru kiln is generally agate, and the appearance is azure, mostly light blue, but also has green, dark green, moon white and other glaze colors.
The glaze is warm and white, as pure as jade, with a touch of butter texture, and the uranium is slightly translucent.
Observe with a magnifying glass, you can see small bubbles like morning stars under the uranium.
Of course, the overall glaze color must be warm and simple, bright and translucent, the color is moist and pure, and the patterns are crystal clear.
This is the main feature. As long as it is Ru kiln official kiln porcelain, it must have the beauty of jade but not jade.
And this one seems to be particularly beautiful, because in Chen Wenzhe's eyes, the glaze color of this Ru kiln porcelain is like the sunset, or like the sky clearing after rain.
This vividly demonstrates the variety of Ru kiln porcelain.
Not to mention other aspects, just being able to do this, that is, being able to change its color, makes this piece of porcelain extremely precious.
Through the glaze color and glaze layer, Chen Wenzhe can also see the fine bubbles under the glaze.
The bubbles under the glaze of this porcelain are not very conspicuous, but they can be observed with the eyes.
This is just right, the bubbles are not too big and do not affect the beauty of the porcelain glaze.
Chen Wenzhe knew that on some Ru kiln porcelain, the bubbles under the glaze were not even obvious and could only be seen clearly under a high-power magnifying glass.
In this way, the beautiful scenery with few morning stars will no longer be visible.
He took his eyes back and looked at the body again, which can also be said to be the bone body.
"Can you knock it a little and hear the sound?"
Chen Wenzhe raised his head again and looked at Wu San.
"Okay, just be careful not to break it!"
Wu San already had a smile on his face at this time, because he could see that Chen Wenzhe was becoming more and more serious.
It was careless at first, but now it’s getting alarming every step of the way!