Building An Outdoor Fire Tornado + Flame Colorant & Slow Motion

In this video I build a Fire Tornado at a much larger scale than my previous experiment some years ago where I made a tabletop fire vortex: My inspiration for using fans to create the vortex was from this video: The green colorant used was boric acid, and for the last clip where the flame had a mixture of red and other colors I had thrown in a handful of strontium nitrate. Fuel was isopropyl alcohol for the standard flame, then methy