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#1 MadMat

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Posted 12 October 2017 - 01:32 PM

I was wondering if anyone has heard of any formulas that use a halogen other than chlorine as a color enhancer. By asking this, I am assuming another halogen could be used as such.

 



#2 Mumbles

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Posted 12 October 2017 - 01:47 PM

There is a table in Hardt of various emitting species and has a variety of halides included if you want some more general information.  There's been some work using bromine, particularly copper bromide for blues. These compositions are generally prepared with copper bromate and/or potassium bromate.  Most of it is kind of bullshit as it's sold as a chlorine-free, chlorate free, blah blah blah mixture without mentioning any of the concerns with bromates.  The color is great though.  That said, there are a few bromine and mixed chlorine-bromine based flame redardants available which are similar to dechlorane that I've had a passing interest in trying.  I included some links to a bit more info.

 

https://phys.org/new...rotechnics.html

http://rec.pyrotechn...mate-blue-stars

https://cen.acs.org/...e-colorful.html

http://onlinelibrary...502752/abstract


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#3 MadMat

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Posted 12 October 2017 - 01:49 PM

Thanks Mumbles. Bromine was exactly what I was thinking of when I asked this question. Even if there was a fluorine based formula, I wouldn't be very interested in trying it... fluorine and most of its compounds are pretty nasty stuff.


Edited by MadMat, 12 October 2017 - 01:51 PM.


#4 AzoMittle

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Posted 12 October 2017 - 01:51 PM

I don't have any details on hand but I remember something about bromides being used for color. I would try to get a hold of Baechle if you can.

 

I know fluorine and xenon compounds have been used for other (non-recreational) pyrotechnic applications, mostly high-energy/light output. Do a Google Scholar search for Ernst Christian Koch, he is one of my favorite authors on the topic.


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#5 MadMat

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Posted 12 October 2017 - 02:02 PM

It's funny you mentioned xenon compounds for high light output. I have "played" with lasers quite a bit and vaguely remember reading somewhere that xenon compounds were used to chemically pump lasers, such as, a dye laser. The article stressed that it was not a xenon flash lamp but a xenon compound that was burned to create intense light. I had long forgotten about that. On the subject of lasers and halogens, copper bromide can be used to create a copper vapor laser :)


Edited by MadMat, 12 October 2017 - 02:16 PM.


#6 Mumbles

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Posted 12 October 2017 - 04:13 PM

Now that you mention it, there are some flares based on fluorine.  Mg/Teflon type mixture or similar fluorocarbons.  They're ferociously bright, and actually extremely sensitive.  If I recall they also produce a lot of infrared radiation as well.


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#7 AzoMittle

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Posted 12 October 2017 - 09:27 PM

Correct on all accounts Mums. The "funny" thing about the Mg/Teflon mixes (and all the fluorine polymers) is that they are incredibly stable until they suddenly become incredibly unstable. Lots, and lots of documentation on them thankfully; I would say stay away unless you know that you know what you're doing. I would suggest reading up on them though, interesting stuff.


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The really important kind of freedom involves attention, and awareness, and discipline, and effort, and being able truly to care about other people and to sacrifice for them, over and over, in myriad petty little unsexy ways, every day. . . . The only thing that's capital-T True is that you get to decide how you're going to try to see it. You get to consciously decide what has meaning and what doesn't. . . . The trick is keeping the truth up-front in daily consciousness. -David Foster Wallace





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