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?

In the latest of a series of questions about the ageing Hawk T1 fleet, Minister of State Maria Eagle confirmed the aerobatic ...

Streets in Southern California were painted red this week as planes continue to fly overhead dropping red clouds over burned areas. But why is it red?