Jingdezhen Traditional Color Glaze Porcelain Firing Technique (Third Batch Provincial Level) Porcelain decorated with glazes of various colors, referred to as colored glaze porcelain. One of the four famous traditional porcelains in Jingdezhen, China. The glaze of colored glaze porcelain is crystal clear, colorful, and the color lasts for a long time. Colored glaze porcelain originated from the green and yellow glaze porcelain of the Shang Dynasty in China. From the end of the Han Dynasty to the beginning of the Jin Dynasty, porcelain decorated with green glaze was developed. In the Tang Dynasty, three-color pottery decorated with yellow, green and purple was created. In the Song Dynasty, Jingdezhen combined the skills of famous kilns such as Jun, Ru, Guan, Ge, and Ding to create shadow blue glaze porcelain that looks like white and blue and can reflect engraved patterns. In the Yuan Dynasty, blue glaze prepared with cobalt ore and "Yuan Jun" and "Yuan Zi" colors with copper as the coloring material were successfully fired. In the Ming Dynasty, based on the experience of firing copper red glaze in the early stage, the red and fresh sacrificial red glaze was created. In the Qing Dynasty, in addition to the creation of the high-temperature "Langyao Red" that is as bright as ox blood and the colorful "Peach Blossom Piece" (also known as "Beauty Drunk"), there are also precious varieties fired at low temperatures such as "Alum Red", "Eggplant Purple" and "Lujun Flower Glaze". Since the 1950s, in addition to restoring and improving more than 50 varieties with historical records, nearly 60 new varieties of colored glazes have been developed and created, such as Sanyang Kaitai, Feather Flower Glaze, Phoenix Clothes Glaze, Rainbow Glaze, and Color-changing Glaze. Colored glaze porcelain is a mixture of coloring pigments and basic glazes that are compatible with it in an appropriate proportion, which are ball-milled and sieved to form a colored glaze slurry, which is applied to unfired blanks or fired porcelain bodies (low-temperature colored glazes are mostly applied to porcelain bodies). Under appropriate temperature and atmosphere, the colored glaze produces a series of physical and chemical changes to form decorative colors. Coloring pigments mainly include: ion coloring type, such as compounds of metals such as iron, cobalt, chromium, copper, manganese, nickel, vanadium, uranium, and antimony. Colloidal coloring type, such as copper red glaze, selenium cadmium red glaze, and cadmium yellow glaze. Crystal coloring type, such as chrome aluminum red, chrome tin purple, vanadium tin yellow, zinc titanium yellow, titanium yellow, vanadium zirconium green, vanadium zirconium blue, mixed black. In order to make the color stable, the coloring pigment is usually mixed with the auxiliary raw materials first, fired into a coloring agent, and added to the basic glaze for mixing and grinding. There are many ways to classify colored glazes. According to the firing temperature, they are divided into high-temperature colored glazes (about 1300), medium-temperature colored glazes (about 1200), and low-temperature colored glazes (about 1000); according to the firing atmosphere, they are divided into oxidizing flame colored glazes and reducing flame colored glazes. Artists are accustomed to classifying them into 6 categories according to the appearance characteristics after firing: monochrome glaze, the glaze surface presents a pure, uniform single color. Complex color glaze, also known as flower glaze, the glaze color presents more than two colors. Including copper red system flower glaze and iron black system flower glaze. Crackle glaze, the glaze surface presents cracks of various shapes. Matt glaze, the glaze surface is dull, presenting a calm and quiet atmosphere. Crystalline glaze, the glaze layer presents colorless or colored crystals, divided into two categories: giant crystals and fine crystals. Color-changing glaze, under different light sources, the glaze surface presents different colors. The color glaze porcelain fired in Jingdezhen is colorful and dazzling, and is known as "artificial gems".