Is green *patina* normal on copper pipes

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Chefwong

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I was opening the access holes in my *finished basement* to vacumn up all the debris that fell while remodeling upstairsand noticed a slight tint of green around alot of the water fittings. Not the body of the copper - just around the fittings itself *elbows, etc*. Granted, this space does get cold and warm - wall cavity.

The copper in my boiler room does not show this discoloration.

Is this normal ?
 

Mikey

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Also a product of not cleaning the pipes thoroughly after sweating the joints, which were probably fluxed with an acid flux.
 
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