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The harder your water is naturally, the more salt it will have when soft.
But still it is a minute amount. I guess it could be the salt that would do that to you.....

I don't see how the word defective could come into play here, these are after all carbon steel, nothing is going to change that it will rust no matter what.

I kind of reminds me of my carbon...

I keep a small jar of carmex(actually a different brand) on my bathroom counter, a quick dip of my finger and a small rub down of the blade. I havent had any problems yet, and it's a lot more...