May have ruined a perfectly good Cascadian Dark Ale. I purchased ball bearings to weigh down hops bags for dry hopping. This was the maiden voyage. After a week in the beer @ 64 F the bearings had a gray-black patina and foul burned rubber smell (some of which was imparted to the beer, I'm afraid; see attached photo-the bearings were bright silver). At first, this made no sense b/c I though I purchased stainless steel bearings but on review of my receipt, they are carbon steel. And on review of carbon steel, turns out it's not corrosion resistant. Sh*t!!!