The wikipedia page on glycerol lists quite a few cases of it killing people when contaminated with diethylene glycol. https://en.wikipedia.org/wiki/Glycerol#Hi

The wikipedia page on glycerol lists quite a few cases of it killing people when contaminated with diethylene glycol. https://en.wikipedia.org/wiki/Glycerol#Historical_cases_of_contamination_with_diethylene_glycol https://en.wikipedia.org/wiki/Glycerol#Historical_cases_of_c... Apparently this was a problem as far back as 1937.