65 for baking and roasting, the firing temperature of 800 ~ 850 ° C, the range of the body was mostly gray, was a small amount of brown or orange red. cavity surface of delicate, smooth, we can see on the surface, brushing a layer of delicate paint handling. Fan mirror plane shape was generally trapezoidal or scoop-shaped, shape roughly bowl-shaped, the back of the ramp to close around, but not quite regular, the central nearly flat or structured, most of the legacy press traces produced when hand wiping or scraping traces their different sizes. mirror range including both mirror back Fan and mirror mirror back Fan thick, usually about 5 cm thick, the front lower part of the center sunken cavity, the upper center of the trapezoidal runner, its on both sides of a flat bar and exhaust ports (riser). mirror Fan thinner, usually about 3 cm thick, the front lower part of the top the middle arc of the gate. Initially, this bronze was first named on the basis of the inscriptions on the internal wall.
The casting process is roughly: to place a button hole in the upper button pit firing has been good ceramic mirror cavity back Fan and adhesive (made of clay) will be fixed, back in the mirror Fan range of agents and the mirror of the cavity surface, brushing off, and then close the range, mirror Fan Fan and then co-lateral bundle the two Fan tight fastening, if necessary, with grass mixed with mud daub between the two Fan the gap to avoid the copper liquid spills from the gap between the two Fan Mirror Fan baking again, and finally casting the mirror back of the cavity and its pattern shows, Linzi mirror range of years for the Western Han Dynasty to the Western Han Dynasty the middle of the main casting pattern mirror for all types of grass pattern mirror, as well as the Pan Chi. All the time, people have named the bronze Si Mu Wu Ding.
Four milk dragon mirror, four milk Xianwen mirror grass pattern mirror 918 to 27 cm in diameter, especially in a diameter of 10 ~ 16 cm for above Tao mirror range of archaeological discoveries show that the Tao Fan-cast mirror traditional to have emerged late in the occasion of the 5th century BC, the Spring and Autumn and the formation of the development of the Warring States period, the occasion of the 3rd century BC Qin and Han fully mature and widely used. Tao Fan-cast mirror technology is characterized by: the production of mirror-range selection of local clay and confusion into the rice husk ash or other ash plant straw, raw materials, widespread, easy to get; molding using the molding method and lithography method. Tian Kai, the vice president of Henan Museum commented the bronze. To facilitate the production of large quantities; clay is easy to shape, ease of casting a bronze mirror with a fine, the harassment of the patterns; the permeability of the range of body, filling capacity, which will help the casting process.
The younger bronze mirrors its pattern forming; mirror of more complex production process, technical requirements for more. Easy to damage in the casting process; its casting (ie, "Tao Fan) mirror" generally seem fine, a clear pattern, stone mirror of discovery and stone Fan cast the mirror traditional stone mirror Fan with rocks as raw materials, production of bronze mirrors cast range, generally referred to as the "stone mirror Fan" rock of the species, classes have quartz long stone porphyry, talc, fine sandstone and so on. The right address of this bronze dragon has always been a subject of much debate in the academic community. in China, stone mirror range of bibliographic can be traced back to the 1930s, but the authenticity is hard to determine; the Shanghai Museum and the Port Arthur Museum collection of talc quality mirror Fan, but of unknown origin, the Port Arthur Museum Tibet is the offspring of pretending to be.
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