Ignition of a thermite reaction normally requires only a simple child's sparkler or easily obtainable magnesium ribbon, but may require persistent efforts, as ignition can be unreliable and unpredictable. These temperatures cannot be reached with conventional black powder fuses, nitrocellulose rods, detonators, pyrotechnic initiators, or other common igniting substances. Even when the thermite is hot enough to glow bright red, it will not ignite as it must be at or near white-hot to initiate the reaction. It is possible to start the reaction using a propane torch if done correctly. The torch can preheat the entire pile of thermite which will make it explode instead of burning slowly when it finally reaches ignition temperature. Wikipedia
Been trying to ignite the aluminum and iron dust my deburr wheel makes just so I dont have to sweep it up. Just cant seem to light the darn stuff. My hand gets too hot holding the metal I have to put it down. I guess I need to grind on some magnesium, I heard dipping it on water helps, any advise?