OK, these are always fun. I recently cleaned out a cache that I had set up years ago. If I read the date code correctly, they were canned December 23, 2002.The tins were stored in what I consider to be ideal conditions; 64-71 degrees f, 40% relative humidity, in a dark basement-like area. However, I was concerned to discover what appeared to be some sort of breach of the can as you can see by the white and brown precipitate at the metal seems of the can.
Well, decided to open the can, expecting the worst.
Honestly, it looked about as good as it probably ever did.
I cut it up and didn't find anything objectionable or any foul odors.
So, I prepared it my favorite way; fried in it's own fat until crispy.
We perform animal testing around here. For any PETA members, Test Subject #001 (aka ATOCHA) was a more than willing volunteer.
We both chowed down and it tasted fine with no ill effects. We finished the can eating it both heated and chilled over the course of 4 days and after a week, neither of us have been rushed to an Emergency Room.
So, the 13 year old tinned Corned Beef was fine despite the precipitate around the seems of the can. The powdery precipitate had a acidic and salty taste.
Tinned Corned Beef is a great item to add to a survival cache. It is cheap (often on sale for ~$1.00 per can) high protein, no fibre, compact calories that require no refrigeration (while canned) and no preparation (although it tastes much better heated IMHO).