Close #OffScriptOn9: How do fireworks work? How do fireworks get their color? What's inside of a firework? Experts discuss the chemical make-up of fireworks and describe how they work. WUSA 7:40 PM. EDT July 04, 2017 TRENDING VIDEOS Inside the chaos: Police release Las Vegas body cam footage FEMA takes back thousands in hurricane aid money Men risked their lives to save Maryland woman in Vegas shooting WARNING: GRAPHIC VIDEO Dramatic video of Las Vegas concert shooting Md. woman loses eye, in coma after Las Vegas massacre FBI profiler: Vegas shooting similar to Texas Tower massacre Allegations of racism, favoritism at PGPD prompt DOJ investigation Woman on a mission to clean up community-one cart at a time Tuesday night weather webcast Father of local shooting victim talks about daughter's call from hospital More Stories Police encounter Bethesda teen at alleged underage… Dec 13, 2017, 10:50 a.m. Snow showers DC and north tonight Feb 18, 2016, 10:28 a.m. 911 operator helps deliver baby in DC Dec 13, 2017, 6:43 p.m.