Gray powder metal, pure, without any visible inclusions and oxidationcolor.
灰色粉末状金属，纯净、无肉眼可见夹杂物及氧化色。
2
In the field operation, can cause annealed wire diameter necked, surface scratch, red copper wire, copper wire color, copper wire oxidation and so on some phenomenon.
在现场操作中，会造成退火后线径变细、表面划伤、铜线发红、铜线变色、铜线氧化等一些现象。
3
Fading and oxidation are not the same, attack faded, paint color is uneven.