Julie Jensen died as a result of ethylene glycol in her system, an ingredient found in antifreeze.

FORBES: Google M for Murder: Internet Search History of Killing Methods Helped Convict Husband of Homicide

In more normal situations operators will inject methanol or mono-ethylene glycol to serve as antifreeze in production systems.

FORBES: BP's Big Box Removed From Leak As Gas Crystals Clog Uptake Pipe

The sensor consists of a gold plate covered by a layer of ethylene glycol (better known to most people as antifreeze).

ECONOMIST: Medical diagnostics