They uncorked it, smelled it and tasted it. It was described as having a heady sulfur bouquet with distinct notes of saltwater and gasoline.
The liquid was a cloudy gray and it tasted like a mixture of crab water, gasoline, saltwater and vinegar with hints of citrus and alcohol.
It might have been a Spanish fortified wine. If not wine, then perhaps a spirit or medicine.
Glad I Didn't Spend Money to Taste. --Old B-R'er