Explain the detailed process of making ancient porcelain.

The technological process of ancient porcelain making is as follows:

1, quarrying mud: clay (porcelain clay) is the raw material for making porcelain, and clay is formed by weathering and decomposition of rocks on the surface of the earth's crust. Artisans need to recycle ore first, and then break it into mud.

Briefly explain "rock weathering": under the action of solar radiation, atmosphere, water and some living things, rocks will be broken and loosened, and under the influence of meteorology (wind, rain, heat, etc.), rocks will be broken into rubble of different sizes. After a long period of baptism, these gravels will become fine soil particles and form soil.

2. Soil panning: The broken ore needs to be scoured to make slurry to meet the requirements of porcelain making process. Tire mud containing too many impurities will be deformed and cracked during firing. Therefore, the quality of porcelain is largely determined by the quality of practicing mud.

The best case of mud panning is the "eggshell black pottery cup" of Longshan culture. It is precisely because the tire mud is repeatedly washed and does not contain any impurities that it can always maintain a dense texture during the drawing process, making the wall as thin as 0. 1 mm without breaking, which is rare in the world.

3. Pulling wheel: Put the prepared tire mud in the center of the workbench, and complete the process of the machine by rotating the workbench and cooperating with the actions of both hands, which is called "blank drawing forming method", also known as "pulling wheel method". The wheel method makes the wall thickness uniform and the shape regular, and also improves the production efficiency.

4. Trimming: Trimming the drawn blank to make the surface smooth.

5, painting patterns: painting patterns on plain tires. In the Tang Dynasty, Changsha Kiln was the first to draw underglaze porcelain, and painted brown and green on the blank. Before that, the pattern of porcelain was only mottled brown porcelain. Changsha Kiln expanded brown spots into brown (green) stripes, which greatly improved the aesthetic feeling and artistry of porcelain.

6. Glazing: There are many ways to glaze porcelain, such as dipping glaze, throwing glaze, brushing glaze, pouring glaze and blowing glaze. There is no such technique as blowing glaze in the fashion of Tang Dynasty). Usually, according to the shape, thickness and use of the blank, the corresponding glazing method is adopted.

Under-glaze colored porcelain: painted on the surface of the blank, then applied with transparent glaze and fired in the kiln, that is, under-glaze colored porcelain. Changsha Kiln is the first colored porcelain kiln (underglaze color) in Tang Dynasty and the first colored porcelain kiln in China.

7. Sagger, a kind of kiln furniture. In order to prevent the influence of kiln environment (dust, smoke, etc. In order not to affect the integrity and beauty of the glaze, saggers were used as instruments to protect and isolate porcelain in the Tang Dynasty. The porcelain fired by sagger has beautiful color and greatly improved quality.

8, into the kiln firing. Put the sagger into the kiln, and control the temperature at about 1200 to complete the porcelain firing process.