Camping gas cooker, hold rim in fingers, neck in flame rotating the case, when it gets too hot (usually the same time the blue tint appears on brass, you shouldn't heat any further than that, otherwise it stuff the brass) I simply drop, no need to douse.
Obviously you can do more at a time/faster with a mechanical setup and some people get the stuff to paint (templaque?) on to indicate temperature more exactly, but you can't overheat it my way anyway unless you like burning your fingers.
My way is what Bryn from Targex projectiles recommended.
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