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Message:: [QUOTE="Just Carl, post: 715014, member: 4552"]That is so true. And in some areas those same nice, shinny pipes turn green almost over night. Copper is so reactive that there are massive problems with dissintigration in the ground when used for Grounding systems. For example in some areas after a few years all such Copper grounding systems have completely turned into Sulfates and are now useless. Even though many such systems are 500 Kcmil in size, in the ground they just react with so many different things that they slowly vanish. Grounding systems for Lightning protection too dissintigrates due to acidic gasses in the air in some areas where Sulfur types of Coal is burned. Many areas use Aluminum Wires and Stainless Stell grounding systems due to this. Any Copper or Brass piping in your house. That too starts to turn green from such gases in the air. I've seen many cents from the 90's ara already looking like something from the distant past. Our air is just not to great lately. AND as to the percent of Copper or anything else in our coinage. Dose anyone ever question the purity of the metals used in those coins? Naturally if the government says 95% Copper, it must be true since they never, ever say anthing that is incorrect.[/QUOTE]