Classification method of bone china grades

In bone china, bone china is divided into different grades. The following is a detailed introduction to the classification method of bone china grades:

It is roughly divided into AAA grade, first-class product, second-grade product, and third-grade product. One criterion for distinguishing grades is to see how many defects exist in the porcelain itself. The number of defects. First, AAA grade: In the form of porcelain or embryo (embryo form refers to the one without flowers and glaze, the whole body is just a white body in the shape of porcelain). The embryos without defects are then processed by painting, glazing, and firing. After they are released from the furnace, the finished products are selected again to eliminate the defective finished products, thus producing AAA grade products; second, first-class products: First-grade embryos are selected from all prepared embryos (good and bad), and embryos without obvious flaws are selected and then processed to produce first-grade products. International standards allow for first-grade embryos to be produced. No more than 5 flaws are allowed; I would like to remind everyone that the one on the bottom of the bowl says AAA grade, and the excellent grade label does not represent the grade of the porcelain itself. What matters is the quality of the porcelain itself.

1. Hold the bone china in your hand and observe. The color of good bone china is the natural milky white color unique to natural bone powder. Observe the permeability of bone china under a bright light to see whether the ingredients of the mug are delicate or not. Good bone china should have good light transmission and uniformity. Impurities.

2. Feel the delicacy and hardness of porcelain with your hands. The addition of beef bone meal makes bone china lighter than other types of porcelain and can be made thinner than ordinary porcelain. The finished product is light, dense and hard (twice as much as daily porcelain) and not easy to break.

3. Then flick it gently with your index finger and thumb, and you can hear a crisp “ding” sound of the bone china. If you rub your hands with water on the mouth of the bowl, it will make a sound similar to that of an airplane flying over. Of course, the sound is relatively small, so you have to listen carefully.