what's the dark grey powder in a firecracker?

I've been taking apart firecrackers, and I've found out that the light grey stuff is the flash powder. so what's that dark grey stuff under it? is it just filler? what's it's purpose?

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cornflaker7 years ago
 I think your probably right, but is it possible for some kind of effect? firecrackers are illegal here but i hear some have special effects like sparks and stuff as they explode (not sure if its true though lol) in that case you should try lighting it with some flash power and see if it burns or sparks etc. then...
An Villain7 years ago
propellant for the dinner blaster.
See if its magnetic, could be iron powder.
Kiteman8 years ago
Different incendiary materials have different ignition temperatures. It could be that the flash powder cannot be ignited directly by the fuse (which will have a relatively low flame temperature), in which case the fuse will light the dark powder which will burn at a higher temperature than the fuse, hot enough to light the flash powder.
codongolev (author)  Kiteman8 years ago
well, the flash powder is actually at the fuse end. the fuse can directly ignite it. I've done it with a lighter; it behaves exactly like flash powder (lots of smoke, large amount of light, big "fwoosh", etc). I'm thinking that back when they used black powder, the amount of powder in the cracker was larger, so they were a certain size, but when the law changed, they didn't want to change the size on everyone, so they just put filler. just a theory. but I've tried igniting it with a sparkler, and it didn't do anything (sparklers burn at like, 2000 degrees, so that should've done it). btw, there's another brand of firecracker I have here that has no filler and just a lot of clay on the ends. maybe that means I'm right.
Ah. I think you've answered your own question, haven't you?
Prfesser8 years ago
Perhaps you're looking at clay that is sealing the ends?
codongolev (author)  Prfesser8 years ago
no, that's red/white (depending on the end).