I wanted to see if anyone else brought or bought silver jewelry here that is changing color? I brought some of my favorite sterling silver pieces from home that were in good condition. Now, they are starting to turn a dark grey color. I don't have anything but a shelf to store them on, but I was wondering if it is something to do with humidity or temperature that could be changing them. I've been cleaning them, but they do not shine up. They are nearly unwearable now and I have been thinking of shipping them home, but I don't usually trust sending jewelry through the mail....