铸铜的气孔,有的小似针眼,有的大如气泡,形状呈球状或椭圆状等。气孔的内面大都是光滑的,颜色有的白亮,有的是黑灰色,主要看是否受了氧化而定。有的气孔内兼有夹渣,那就无一定的形状和颜色了。一般的说,大的叫气泡,小的叫针眼。普通铸件上针眼较多,特别是小铸件。在大铸件上有—二个小的针眼,还没有什么关系,如果 Bronze stomatal, and some small needle-like eye, some as large as a bubble, the shape was spherical or oval and so on. Most of the inner surface of the stomatal smooth, white and some bright colors, some dark gray, mainly depends on whether the oxidation. Some pores have both slag, it is not a certain shape and color. In general, the big bubble, called the pinhole small. Ordinary casting more eye on the needle, especially small castings. There is - on the big castings - two small pinholes, it does not matter if