The color of the products is argent grey metallic shine, smooth, unknit. They mustn't be oxydic badly, lacking of sintering, over heating, delamination and cracking.

产呈银灰色金属光泽、光滑、平整、不得有严重氧化现象，不得有欠烧、过熔、鼓、、裂纹等缺陷。