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Centers for Disease Control says chloroethane, which is also called ethyl chloride, is a colorless gas with a sharp odor that can also exist as a quick-evaporating liquid.

“But if you come home and there is no smell, you can’t assume there’s nothing there, because a lot of the toxins we’re talking about are odorless and colorless.”

Hydrogen sulfide is a colorless, flammable, highly toxic gas with the odor of rotten eggs.

The city’s dirtiest cop was also the most colorless, with a forgettable face and a personality as vague as fog.

Methylene chloride, also called dichloromethane, is a colorless liquid that emits a toxic vapor that has killed at least 88 workers since 1980, the EPA said.