[Aerich]

Then it's the eggs (he says, showing off his amazing deductive reasoning skills).

I sincerely hope those were the first eggs out of the dozen that you tried to use. There could be *anything* contaminating those eggs.

I'd still not rule out the oil, though. The way you described it sounds like a fast-acting chemical reaction. Quality control might have missed one bottle with something nasty in it that only reacts to eggs. Although, if you've used it already (for frying?) that makes the eggs the prime suspect.