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.

The researchers suggest that adding small amounts of ferrihydrite-like or other colorless biocompatible iron minerals to dental care products could provide exceptional protection for human tooth enamel.

This colorless, odorless gas is emitted from the breakdown of radioactive material naturally occurring underground that then seeps through building foundations.