“ 163g。 Huang Shizhang in shallow yellow field. The overall color is light yellow, and the stone has the characteristics of pit stone. It is radish-shaped, with obvious red ribs, and the surface is thin and decorative. It is a work in the late Qing Dynasty and has a high collection value. " Braised Red Square is mostly produced in the upper and middle Bantian, with the outer layer as red as red dates, the surface often has black patches such as black skin, and the volume is also extremely small, the brightness is second to that of orange peel Red Square, and it is microscopic and transparent, with slightly harder and drier quality than Tian Huang, and often has inconspicuous radish patterns.
According to legend, Oda yellow in soil is a rare product because it is smoked and burned by fire when burning grass in stone farmland, and it changes color when it reaches a certain temperature. However, most of them are not cherished by collectors because of their dry texture and less materials. There are two kinds of black fields: pure black and gray black.
Pure black field refers to black ochre field. Most of them come from Tietouling and Tanaka in Xiaban area, and there are often yellowstone skins. The quality is also fine. Radish grains are slightly thicker than other colored fields, and the texture is turbid and slightly transparent, often accompanied by tiny black sand nails (Figure 3 1).
The gray-black fields are brighter and grayer. The skin is black or yellow, thick and hard, with black sand spots and muddy appearance. Radish lines are often rough. In addition to the above, Shanghai and Nakasaka also often produce. It is a subordinate field (Figure 32).
Occasionally, there are black fields, with fine texture and fine texture, and the texture is grayish black and blue-green. People may call it "green field" (Figure 33), which refers to the field stone with white outside and yellow inside.
Many white fields always have a yellow heart, and Tian Huang often has a white skin. "Silver-covered gold" originally refers to a field with more yellow hearts or a slightly thicker yellow skin, which is collectively called "silver-covered gold". The yellow heart of the former is also like the sweet potato with yellow heart. Huang Yiming is pure and elegant, and its quality is extremely delicate and greasy, while the grain is more subtle and difficult to find than all kinds of fields and stones, and it is almost invisible. The yellow color of the latter is mostly between golden yellow and osmanthus yellow, close to golden yellow, but slightly pink with fine radish lines. Silver-wrapped gold with good coiling and good color also belongs to the top grade in Shi Tian (Figure 35). Refers to the fields and stones dug by Sakamoto, and the muscles are hard and thick. The skin looks like cow's egg skin or deer's eyelids, but the cortex is slightly thinner than cow's egg yolk, and the skin color is dark and slightly green. Rough texture or wireless strips or lines. Poor permeability, sometimes containing hard sand (Figure 40).
Identification of Tian Huangshi
Tianhuang is a natural massive monolith, which looks like pebbles, but it feels delicate and moist after a little rubbing. After carving, it is dazzling. Mr. Pan Zhulan said in his poem: "I was born in Fujian, and I met Emperor Mo, Beijing. It is expected to be warm and clean, and it is by no means boasting that people are enemies. " Tian Huangshi's appraisal is not unfathomable. As long as we have frequent contact, careful observation, scientific analysis and accumulated experience in practice, we can deepen our knowledge and understanding of Tian Huangshi and appreciate its own characteristics. The characteristics of Tianhuang, such as skin and bones, muscle texture, category, tone, lattice and specific gravity, and the difference between Tianhuang and other unearthed stones are the main basis for distinguishing Tianhuang.