How to identify Yuan blue and white porcelain

The way to identify Yuan blue-and-white porcelain is to look at tires, bubbles and colors in glaze.

1, tire

Blue-and-white porcelain in Yuan Dynasty is heavy and firm, with thick and enlarged walls. Because there are many impurities, most tires have iron brown spots. Tires are made of sorghum hemp soil. Kaolin is white but not fine, because the crushing conditions and technology were limited at that time, so many pores can be seen. Now the tire is very thin and has no air holes.

In the past, the old tire mud has gone through the process of aging, and the organic matter will change after aging. So its tires have a delicate feeling, and the tires made now are not stale and look very dry. The plasticity of porcelain raw materials processed by modern machinery is generally not as good as that made by hand in Yuan Dynasty.

2. Bubbles in glaze

Old Yuan blue and white were all burned in wood kiln, and now most imitations are burned in gas kiln. The chemical and physical changes of enamel vary with different processes. Especially in the process of forming bubbles in glaze, it is different. The bubbles from the ancient firewood kiln should be different in size and bright.

However, the bubbles from modern gas kilns are getting smaller and less transparent. This is only relative. It does not rule out that modern counterfeiters use artifacts copied from wood kilns, and they have to conduct in-depth research from various aspects such as shape and decoration before they can make a judgment.

Step 3 color

Blue and white hair is rich in color, elegant and blue-gray. Brilliance is imported Sunibo clear material, while elegance is a mixture of imported material and domestic material. A considerable number of blue and white flowers have black spots, which are deeper after firing. The original Yuan blue and white flowers are all made of imported suma green materials, which have a characteristic of high iron and low manganese. Blue and white flowers are dark blue with a little purple, and green ones are slightly green.

The main component of Subei Qing used in Yuan Dynasty is cobalt oxide, which contains a small amount of iron oxide. Under the action of high temperature, the iron oxide in "Subeiqing" will gather together in silicate liquid to form dark crystal spots. Microscopically, most of them are irregular sauce brown spots, which sink under the glaze.

Most modern imitations simply add iron oxide powder in the production of domestic blue and white flowers. Under the action of high temperature, these iron oxides will quickly float to the glaze to form crystals. Microscopically, most of them are slag spots.