Parts of Southern California are covered with pink fire retardant as firefighters try to control deadly wildfires raging in ...

Crews battling the deadly ongoing Los Angeles wildfires have started dropping bright pink fire retardant known as Phos-Chek from the skies to combat the stubborn flames. The eye-catching flame ...

As fire crews and air tankers work to block the wildfires' explosive growth, images of red clouds of fire retardant falling onto trees are common. What is it — and what's in it?

Los Angeles firefighters are using Phos-Chek, a bright pink fire retardant, to combat wildfires threatening lives and property. Developed by Perimeter Solutions, Phos-Chek helps slow the spread of ...

The vibrant red fire retardant is known as Phos-Chek and has been used by firefighters battling wildland blazes for over 50 years, according to its manufacturer, Perimeter Solutions. Between 2009 ...

The vibrant red fire retardant is known as Phos-Chek and has been used by firefighters battling wildland blazes for over 50 years, according to its manufacturer, Perimeter Solutions. Between 2009 ...

"It's primarily a product called Phos-Chek ... which is sold by a company called Perimeter," Daniel McCurry, an associate professor in civil and environmental engineering at the University of ...