For me, it is "salt". There was a time period what that was somewhat of a thing. I fell for it and purchased several lures that were "salt infused". Going through some old tackle and it reinforced that is a great way to have a lot of rusty jigs. Not worth whatever benefit it may or may not provide for me.
Now... I've got to figure out a good way to clean up and sharpen some back up... :-(
