I've been buying a lot of silver plated beads from www.GoodyBeads.com, and so far I haven't really had any trouble with them. When I'm not using the beads, I keep them stored in an air tight container just to be on the safe side, but all too often I end up leaving a handful out on my design table. So far those look just fine, and I'd say they've been in the "air" for maybe 3-4 months now. Also, when I complete a design I keep it in a plastic baggie just to be safe. I like to mix my silver plated with some sterling sometimes, and I don't want any of it to tarnish. So far so good. Hope that helps!