From: ouasami@do-not-send.com   
      
   Many copper salts are blue. So, they can't be told by color.   
      
   I have a piece of copper in the filter of a swimming pool. After a   
   while, the surface turned blue. It can't be copper chloride because   
   copper chloride is very soluble in water. What could it be?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)