Tonight I was making hot dogs for supper, and realized that I had used the last of the bottle of mustard I had in the fridge the previous weekend. So I went to get another bottle out of the cupboard. The first thing I noticed about it was that the bottle was bulging inward, like something had decreased the pressure inside. That’s peculiar… Around here, you’ll often see things bulging outward, if they were packaged at sea level, but not much is packaged at significantly higher altitudes than us.
The second thing I noticed was that the color seemed off. Honey mustard is usually a fairly light color, but this was quite dark brown. That’s also peculiar… I don’t think it was that color when I bought it.
Alerted by these clues, of course, I didn’t just slather some on my hot dogs. I opened it up (the seal seemed to be intact, incidentally), and tasted a very tiny amount. Well, I’m not sure just how to describe the flavor, but I can certainly say that it wasn’t good at all, and with a very persistent aftertaste.
The bottle is closed back up and sitting in my trash, but I’m curious. What sort of spoilage would decrease the pressure in a bottle of mustard, and turn it dark?