The close up observation made in the above video is confirmed in raw video footage of this event:
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Homemade Thermite Cutters cut and blast through steel beams.
Nano-thermite, also called "super-thermite",[1] is the common name for a subset of metastable intermolecular composites (MICs) characterized by a highly exothermic reaction after ignition. Nano-thermites contain an oxidizer and a reducing agent, which are intimately mixed on the nanometer scale. MICs, including nano-thermitic materials, are a type of reactive materials investigated for military use, as well as in applications in propellants, explosives, and pyrotechnics.Although super-thermite and nano-thermite are interchangeable terms, thermite with additives such as sulfur and/or barium nitrate known as thermate is also sometimes incorrectly referred to as super-thermite. Case in point, the definition of thermate contains no mention of it being called super-thermite.
What separates MICs from traditional thermites is that the oxidizer and a reducing agent, normally iron oxide and aluminium are not a fine powder [such as in Romero's experiment], but rather nanoparticles. This dramatically increases the reactivity relative to micrometre-sized powder thermite.