Chapter 1023: Different light changing color glaze
This time Chen Wenzhe was really amazed when he heard it. He really learned a lot of useful knowledge.
However, he felt a little strange. Thinking about the knowledge points just mentioned, it seems that they all involve the five famous kilns of the Song Dynasty?
Especially for Ru Kiln, the two old men said it more deeply!
Although he was a little confused, Chen Wenzhe didn't take it seriously because Ru kiln porcelain was so rare.
Now that I have an opportunity to have an in-depth exchange of ideas, I can’t miss it.
However, he still stayed cautious. From now on, he would pay special attention to any knowledge points related to the five famous kilns.
Nowadays, Chen Wenzhe doesn’t talk nonsense even when people are serious.
Since you said color, I'll say discoloration.
Chen Wenzhe is still most interested in blue and white porcelain, and what he does most is blue and white porcelain.
Of course, the best porcelain he has access to is blue and white porcelain.
In this aspect, Jingzhen's side is definitely more professional, and at least they can do more blue and white flowers than him.
Since the two old men mentioned the changes in glaze color and also the changes in blue and white colors, Chen Wenzhe didn't mind having an in-depth discussion.
By the way, he also took a look to see if the two old men would once again extend the topic to the five famous kilns, or simply to Ru kiln porcelain?
When talking about the beauty of blue and white, we must mention the color-changing blue and white, which also contains deep meaning.
Antiques in prosperous times and gold in troubled times are definitely in the prosperous times now, and the value of antiques is also rising. However, how many people really understand the beauty of antiques?
Of course, this is not talking about insiders, but even among insiders, how many people know that blue and white can change color?
Not many people know about the color-changing blue and white, and even fewer have seen it.
Most of the blue and white flowers before the third Qing Dynasty would change color with different lighting and angles.
In addition, it is closely related to the length of sunshine and whether it is exposed to sunlight. The longer the sunshine, the darker the color. The longer it is kept out of the sun, the duller the color will be, and this can be reversed.
These characteristics become more obvious as blue and white porcelain becomes older.
It will take time to truly understand this characteristic.
It is difficult for ordinary people to understand, how can inorganic blue and white porcelain change color?
But the ancient people in China must have explored and tested it, and they confirmed this. However, they were limited in their knowledge and experience, and could not delve deeper.
Of course, whether anyone agrees with this or not, it exists objectively.
Now for the sake of inheritance, Chen Wenzhe really doesn’t mind saying a few more words.
You must know that the color-changing blue and white has another meaning, which refers to the blue and white hair color that was popular during Wanli and Tianqi years.
It changes from green to blue, from blue to green, and most importantly, it is fired in a kiln.
On the same porcelain, different colors will appear in the same stroke, the angle of the light source is different, and the colors felt are also different, but it is just an exchange of green and blue.
Chen Wenzhe knows a lot of this type of porcelain, but he is not yet sure of the exact glaze color formula, so he has not fired any of them.
I mentioned this point this time mainly to test it out and see if Jingzhen has done any research on it.
If so, then the glaze ore he needs may be available from them.
Since we are talking about color-changing blue and white, we must also mention the color-changing ground glaze.
Until now, this discoloration of the glaze is not understood by people, but it is an important basis for the identification of ancient porcelain.
Porcelain is an inorganic substance and will change color. It is difficult to explain, but it exists.
The glaze of blue and white porcelain is generally from white to duck egg blue.
Duck eggs are green in color and turn white after being closed for one year;
Three days into Kaifeng, the color turned green.
If there is discoloration of the glaze, some mineral materials in the form of blue dots will be found in the glaze. This kind of glaze color cannot be imitated at all.
This situation occurs in many glazes.
Unfortunately, this performance is a bit passive. From ancient times to the present, many people have discovered this change, but it is not easy to prepare and grasp the color-changing porcelain you want.
Blue and white are magical, and the noble Suma Liqing among the blue and white can also change color.
All blue and white flowers containing sumac will change color.
After being closed for a long time, it turns dull and white. The longer the sunshine, the darker and brighter the color.
If you have a pair of ancient porcelain, you will know after a comparison.
There are very few Suma leaves left in the world, so it would be very difficult to see it change color.
Of course, it is not easy to see the beauty of Suma Liqing, but it is not difficult to see the discoloration of glazed porcelain.
After all, modern technology is developing rapidly. As long as you have the will, what can't you do?
Chen Wenzhe is not an old man. He pays attention to the development of science and technology, and he learns quickly and easily.
This time I met two old men from Jingzhen who had profound knowledge and were willing to communicate with them. Naturally, they had to come up with some useful information.
However, before that, he needs to speak in depth first, so that people can gain something from listening!
Therefore, Chen Wenzhe took out the color-changing glaze that he had researched but was not very clear about, mainly for fishing!
Modern research has proven that the principle of ceramic color-changing glaze is that different firing temperatures cause the glaze layer to show different colors.
Therefore, this kind of color-changing glaze is also called "different-light color-changing glaze", which means that the glaze color changes with different light sources.
When it comes to this, we need to use modern science and technology.
The identification of a bronze vessel previously made Chen Wenzhe pay special attention to the impact of technological development in modern times on the manufacture of porcelain.
There is also the chemical material for making ox hair patterns discovered by Zhang Gu before, and the research on glaze color changes can also be regarded as one.
With this kind of technology, even Jingzhen can't say how good it is.
So the two old men were attracted by Chen Wenzhe's slight mention.
They know that glazes sometimes change color, but they really don't pay much attention to this.
To be honest, Chen Wenzhe knows a lot. Of course, this time he learned it not from ancient inheritance, but from various scientific journals.
The idiomatic color-changing glaze uses the white glaze of high-grade fine porcelain as the base glaze, and uses metal oxides, non-metal oxides, cerium, praseodymium, ytterbium, etc., mixed with rare earth oxides as coloring elements, and is processed through a certain process. Make glaze slurry.
After being applied to the surface of the green body, it will undergo physical and chemical changes at an appropriate firing temperature to form a new solid solution.
This kind of thing can change color under different light sources.
For example, it appears pale purple under sunlight, azure under fluorescent lamps, dark green under mercury lamps, orange-red under high-pressure sodium lamps, etc.
After porcelain is fired at high temperature from the kiln, whether it is blue and white porcelain or high-temperature colored glazed porcelain (including white body porcelain), the color of its glaze will not change.
However, because the glaze of color-changing glazed porcelain is mixed with neodymium, cerium and other rare earth elements, the atmosphere changes during high-temperature firing. The oxides in the porcelain kiln can selectively absorb light of certain wavelengths and convert other wavelengths of light.
Light is emitted or transmitted, causing the glaze to show a certain color.