Sample sterling chain, and the same chain with the dreaded copper flashing…
Copper is awesome. It carries electricity through our world, and it makes many things blue, like octopus blood and turquoise stones. We’ve been making stuff out of copper for, oh, something like 10,000 years. Yep. Really.
No surprise that we magpie humans first used copper for jewelry (ooh, shiny, pretty!), and we are still using it, a lot of it, in making jewelry today. Even when metal isn’t copper colored, it can still be mostly copper, like brass, bronze, and nickel silver (which, confusingly, contains no silver).
Most of the time, copper is a tremendously pliant and forgiving player in the jewelry studio, but occasionally it “misbehaves” and ends up in places we don’t want it to be. Sometimes… we pull a piece of silver or brass out of the pickle, and it’s… gah! it’s PINK!! Do not despair, chemistry is the cause, and chemistry will come to the rescue!