What colour does smoke from a class D fire progress through?

What colour does smoke from a class D fire progress through?

• A. White/Light gray to dark gray to black
• B. Blue
• C. Green
• D. Red

Answer: (A)

Smoke color progression for a Class D fire reflects burning metals and their oxide particles. At first, you often see white or light gray smoke as the fire begins and metal oxides and steam form. As the fire intensifies and more metal is involved, the smoke darkens to gray and then to black due to increasing concentrations of fine metal particulates and oxides. This pattern—white/light gray advancing to dark gray and finally black—is characteristic of metal fires, which is why the correct description is white/Light gray to dark gray to black. Blue, green, or red smoke isn’t typical for Class D metal fires.

Smoke color progression for a Class D fire reflects burning metals and their oxide particles. At first, you often see white or light gray smoke as the fire begins and metal oxides and steam form. As the fire intensifies and more metal is involved, the smoke darkens to gray and then to black due to increasing concentrations of fine metal particulates and oxides. This pattern—white/light gray advancing to dark gray and finally black—is characteristic of metal fires, which is why the correct description is white/Light gray to dark gray to black. Blue, green, or red smoke isn’t typical for Class D metal fires.