What's the matter with these soda cans? I have two cans of diet pop that are bulging on the bottom (pics inside). Is this botulism or does it pose any danger?
About a week ago I bought a 12 pack of Diet Sierra Mist from my local grocery. I just opened it today, grabbed a can and noticed something odd; the bottom of the can is bulging out in a squarish shape [pic]
. I checked the rest of the case, and found one other can that is also bulging on the bottom, this time in a triangular shape [pic]
. The second can has a small black mark on the bottom but I'm not sure that means anything. Otherwise the cans appear fine, no other bulges, no visible punctures, the cans feel full and as heavy as a normal can.
What would cause this? I've heard of cans bulging after they're frozen but not just on the bottom. And I think it's unlikely they were frozen at any point, since this is June in North Carolina and they weren't even bought cold, let alone frozen. They haven't even been stored in the fridge.
If I open them will they explode? Spray botulism spores all over me? Could I drink them?