Air tankers are dropping thousands of gallons of red flame ... That's ammonium nitrate. Phos-Chek commonly contains two types ...

How is flame retardant made? Common fire retardants, such PHOS-CHEK, which is used in Los Angeles, include fertilizers, such as ammonium polyphosphate, diammonium phosphate and diammonium sulfate ...

The substance, vivid against the grey smoke and charred landscape, is a fire ... of ammonium phosphate (see graphic). Other ingredients include thickeners made from gum. This makes the retardant ...