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Re: What's that blue stuff in starter cables?
Posted to Technical Theory Forum on 2/3/2003

One possibility is "blue vitriol" a hydrated form of copper sulfate: CuSO4*5H2O. Would come from reaction of battery acid and copper. There are also gray and green versions.

Verdigris is either green, greenish blue, or blue depending on which form of copper ... Login to read more.