The Slow Mo Guys made a fire tornado in 2015 and rainbow colored flames in 2016. Now Gavin Free has combined the two experiments and recorded it on their 1000-fps camera to give us a real good look at it. The colors are made by burning different chemicals, and the tornado is due to 14 fans aimed obliquely at the fire. The surprise comes when the different burning chemicals express their colors at different flame heights, instead of colors just twisting around each other. Cool! (via Laughing Squid)
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