Tiger eye stone is also the tiger eye we usually call. Most of its appearance is like a tiger-like road, the color of black and yellow is brownish yellow, but there are also blue and reddish-brown tiger-eye stones. Tiger eye stone has the same domineering and strictness as
According to the national standard GB 2546-88, polypropylene resin is classified according to polymer type, main use, isotactic index, melt index and material characteristic properties. The polypropylene resin was composed in the following order. Material characteristic performance melt index (see
According to the national standard GB 2546-88, polypropylene resin is classified according to polymer type, main use, isotactic index, melt index and material characteristic properties. The polypropylene resin was composed in the following order. Material characteristic performance melt index (see
The identification of ancient jade articles usually includes such parts in the industry. One is to identify jade, the other is to identify the shape of the jade, the third is to identify the age of ancient jade, that is, the age of the production and use of ancient jade, a