Of Course It's A Bar
You've given me an interesting challenge. This is something I've never seen before. It's organic, and decaying, and quickly. What it decays into is corrosive and explosive, but not a mutagen. Fresh, I would guess it's a very powerful mutagen, but it seems to break down into its destructive product upon exposure to oxygen. I really need a sample that's fresh to determine more about it. One that hasn't been exposed to oxygen.