What Causes Blue Stains in Bathtubs When Using Well Water?

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We use well water. I know it is high in iron content. The water stains the bath tub a sort of neon blue color. Not sure if it is only the hot water that does this. Does anyone know what might be in the water that would cause this. Could it have anything to do with the pipes "copper"?
 
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Copper piping is one of the best guesses. Not an absolute certainty without further testing, but a very good guess.
 
If it is just from the copper pipes, then there shouldn't be any cause for alarm right. Is there anything that it could be which is harmful?