I noticed during fermentation that my wine had a hydrogen sulfide smell. I managed to make it go away through splash racking. I learned that Red Star Montrachet yeast is a high producer of H2S, so maybe that was it. Now that I've poured the bottle, I noticed the smell. It's not very strong, but you can definitely tell that it's there. If I do the copper trick, you can't smell it anymore. The wine itself tastes pretty good, I just wanted to make sure it wasn't going to make me sick or anything.