The fine tungsten powder has been effectively obtained by hydrogen reduction of purple tungsten oxide.
用氢还原紫色氧化钨可高效地获得细钨粉。
A look that is to look at the color, red copper is copper, metallic luster is rose red, the surface oxide film formed after the purple, it is commonly referred to as copper.
一看即看色泽，紫铜是铜单质，具有玫瑰红色的金属光泽，表面形成氧化膜后呈紫色，故一般称为紫铜。
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