How To Distinguish Red Copper, Brass, Bronze And White Copper

Copper, brass, red copper (also known as copper), bronze (gray or gray yellow) is distinguished from the color, which is easy to distinguish copper, brass; Red copper is pure copper (impurity < 1%), bronze (other alloy components about 5%) slightly difficult to distinguish. When not oxidized, copper color is brighter than bronze, bronze slightly cyan or yellow dark; When oxidized, red copper turns black, and bronze turns turquoise (the harmful oxidation of much water) or chocolate.

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