by Emily Harari Every 4th of July, many Americans turn their gaze to the night sky. From a pop of color and a quick clap like thunder, fireworks unveil themselves. In addition to gunpowder, a lesser known ingredient called perchlorates are responsible for the mesmerizing explosions. Perchlorates are salts containing an ion called perchlorate – a chlorine atom bonded to four oxygen atoms. These salts can serve as oxidants for fireworks and explosives, but also can be toxic to living […]