we built a new master suite onto our house. Had these sinks to plan the room around. They were so beautiful. When the plumber put them in with their nickel stopper, noticed the rim was darker and also streaks of copper showing. Then over the next couple of weeks while construction was being completed, we started noticing "spots" of copper showing. We could use this bathroom somewhat and did some.I thought some subcontractor was rinsing a harsh substance into the sink. I was getting sick about it. Then I noticed a spot would show up after we used it to brush our teeth... whitening toothpaste! Since we changed to plain, haven't had any new spots. Wish so much we'd known this. If I csn get a liquid pewter to touch up, they can be restored somewhat. The rating is because we could have prevented this if we'd only known. I would recommend the sink with the knowledge... you have to be careful!