💨 Abstract

Air tankers are dropping fire retardant, including a bright pink substance called Phos-Chek, over Los Angeles to help combat raging fires. The substance, a mixture of ammonium phosphate and iron oxide, is used for its visibility and ability to continue working after water evaporates. It has been used by the US Forest Service since the 1960s and is considered "practically non-toxic" to humans and animals.

Courtesy: www.thesouthafrican.com