from Han dynasty tomb structures or coffins. Although such wood is very dry, it is not necessarily the best since it may be infected with wood worm or be of inferior quality or type. Many modern qins made out of new tong wood (such as those made by Zeng Chengwei) can surpass the quality of antique qins. Unfortunately, the supply of good wood to make qins has dwindled in recent years, causing a rush to make more qins. Paulownia takes many years to grow and requires a curing period of at least 20 years for the sap and moisture to be properly removed. As for old wood from old houses, there are not much old houses left after modernization of the cities and towns. The names of the woods used are not exact but ambiguous and one name could be used to name a variety of different woods, or a wood may have several different names. Construction Process There are two sound holes in the bottom board, as the playing techniques of the qin employ the entire surface of the top board which is curved / humped. The inside of the top board is hollowed out to a degree (if the board is too thick, then the sound will be dull and deadened; if the board is too thin, the sound will be too bright and loud). Inside the qin, there are 'nayin' 『納音』 sound absorbers to reinforce the sound, and a 'tian chu' 『天柱』 and 'di chu' 『地柱』 soundposts that connect the bottom board to the top (which act as sound reinforcers but also anti-warping devices). The boards are joined using a "hinge joint" method to produce the typically mellow sounds of the qin. Lacquer 『漆』 from the Chinese lacquer tree (Rhus verniciflua) is then applied to the surfaces of the qin, mixed with various types of matrix, the most common being "lujiao shuang" 『鹿角霜』, the remains of deer antler after the glue has been extracted. Often, ceramic powder is used instead of deer antler powder, but the quality is not as good. After the lacquer has dried (a qin will need several layers), the surface will be polished using oil stones. At the head end of the instrument is the "yue shan" 『岳山』 or bridge, and at the other end is the "long yin" 『龍齦/龙龈』 (dragon's gums) or nut. There are 13 circular mother-of-pearl inlays which mark the