Represents the glaze aging of porcelain. By observing the distribution of dead bubbles in ancient porcelain glaze and analyzing their changes, the basic law of the relationship between dead bubbles and porcelain age can be obtained:

1, the older you get, the more and more dead bubbles are distributed in the glaze.

2. The older you get, the more zigzag or cross-shaped lines appear at the top of the death bubble.

3. Dead bubbles in Yuan blue-and-white and Yuan in-glaze red porcelain do not appear in the form of bubble rupture, but some white cotton wool-like crystal spots appear in the glaze. They are mixed with bubbles in the glaze and naturally distributed like clouds in the sky.

4. The dead bubbles of ancient porcelain above the Song Dynasty have basically broken into circular potholes, and a large amount of domestic garbage is still deposited in the potholes.

Extended data main porcelain categories:

1, original porcelain. Glazed pottery that appeared in Shang Dynasty is called primitive porcelain and belongs to celadon family.

2.celadon. Refers to one of the high-temperature color varieties, and its blank and glaze have high iron content. After firing at a high temperature above 1200 degrees, the glaze on the surface of porcelain has a shiny green light.

3. Black porcelain. Suitable for black high temperature glazed porcelain. It is a variety developed on the basis of celadon, and iron oxide is also used as a colorant for glaze. With the increase of iron content, it becomes black porcelain, and the content of iron oxide in its glaze is above 5%. Black porcelain was created and fired in the Eastern Han Dynasty, and the glaze of black porcelain fired in Shangyu kiln in Zhejiang Province was thick and uniform.

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