I made a batch of preserved Mexican limes about 2 months ago using a reliable-sounding recipe I found online. It seemed to work - after 3 days I put it in the refrigerator as directed and basically left it alone. One thing led to another, and I never got around to trying them Today, I looked at the jar and the liquid was murky and thick looking, with swirls of light gray running through it.
Did it spoil? If so, what would cause it? I can't understand how anything bad could grow in that much salt.