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The trail of red clouds dropped over wildfires is known as Phos-Chek. This is a brand of long-term fire retardant. It has been used to fight fires since the 1960s, according to AccuWeather.

is fire retardant — much of it a product called Phos-Chek that has been used by the US Forest Service since the 1960s. “You can see it so easily … it’s amazing stuff,” says Jason ...

This occurs even once the water has evaporated in the fire, according to the USDA. The water in long-term fire retardant is mainly used to disperse the fertilizers over the wildfire uniformly.