How to identify the quality of Zhangqiu black stone

1. From the perspective of color identification: high-quality Zhangqiu black, bright color and high brightness. The penetration level of the dye can be seen at the fracture of the slate, and sometimes it needs to be edged with a sharp tool to check. There is not much positive color on the surface of the stone. , The color of the cloth is average, and there is no light and dark situation.

2. From the appearance point of view: the quality of Zhangqiu stone is precise, the texture is average and fine, and there is no bump, and there will be many shortcomings that cannot be covered after the inferior stone is processed.

3. From the sound point of view: the inferior stone usually chooses the rust stone with poor stone quality, high porosity and high water absorption, which can be distinguished by tapping. High-quality stone is usually loud and clear.

4. From the point of view of recognition: the high-quality Zhangqiu black cutting edge is neat and has no missing corners, and it is not rough when touched by hand.

5. Judging from the pattern approval: the color of the stone surface pattern is an important indicator for evaluating the quality of the stone. If the processing technology and technology are unqualified, the waste will appear warped, dented, stained, stained, missing edges, missing corners, cracks, etc. Color lines, pits, etc. Such stones are definitely not good products.