HalGuard’s slick-looking fire extinguishers were originally developed for auto-racing. The “clean”, electrically non-conductive cleaning agent they use, called Halotron 1, is perfect for not destroying wiring and electronics. It quickly transforms into a gas, leaving no icky residue after use.
No, this is not a Photoshop. It was taken on the 4th of July by Spencer Weiner of the LA Times, showing a firefighting airtanker dropping state-of-the-art fire retardant on wildfires in southern California.