Diethylene glycol (DEG) is a chemical compound used as a solvent and a viscosity modifier. It is a clear, colorless liquid with a low boiling point that is miscible with water and most organic solvents. DEG is a widely used industrial chemical, primarily in the paint and coatings, photographic, and plastics industries. It is also commonly used as an antifreeze, coolant, and a de-icing agent. DEG is toxic when ingested and can cause severe health effects.