|MadSci Network: Chemistry|
Now this is a bit puzzling, as little data is available. I assume the salt is sodium chloride (Normal salt as supplied for e.g. cooking?) I also assume the wires are copper wires and are in contact with the solution? If this is so, the blue might be copper chloride (should be blue-greenish) or, if sulfate is present, blue as copper sulfate may be formed. I also assume "short" means something like an hour? If it has been days, algae growth might be considered. So: use sulfate free salt, carefully keep the wire from contact with the solution. Have fun. Kai Bester
Try the links in the MadSci Library for more information on Chemistry.