You can drop a lit match on a pile of magnesium chips or scrapings and nothing happens, but if you let the magnesium sit with a constant flame it will eventually reach a certain temparature and ignite.

I see magnesium as a means to create a flame that will not extinguish under adverse conditions (windy, wet) but only when added to a fire starter like (Craig's fav) Coghlan's Emergency Tinder, fatwood chips, waxed cotton balls, etc.

At what temparature does magnesium ignite and does the granule size make a difference as to the temparature needed to ignite magnesium?

So what temparature