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- Path: sparky!uunet!ogicse!decwrl!purdue!mentor.cc.purdue.edu!bragg.bio.purdue.edu!MAIZE
- From: maize@bragg.bio.purdue.edu
- Newsgroups: rec.juggling
- Subject: Re: Coloured Flames - FAQ answer
- Message-ID: <C1FJEw.G85@mentor.cc.purdue.edu>
- Date: 25 Jan 93 21:52:06 GMT
- Article-I.D.: mentor.C1FJEw.G85
- References: <1993Jan25.141653.14526@craycos.com>
- Sender: news@mentor.cc.purdue.edu (USENET News)
- Reply-To: maize@bragg.bio.purdue.edu
- Organization: Purdue University, Dept. of Biological Sciences
- Lines: 61
-
- In article <1993Jan25.141653.14526@craycos.com>, rh@craycos.com (Robert Herndon) writes:
- >As a safety comment, I would STRONGLY RECOMMEND AVOIDING the
- >use of lithium perchlorate with methanol. Lithium perchlorate
- >is a strong oxidizer; mixed with a good fuel, such as methanol,
- >one possible result is a potent and rather unstable explosive.
- >Lithium perchlorate is also likely to eat one's torch wicks up,
- >although I cannot (and will not) verify this through personal
- >experience.
-
- I have used lithium perchlorate in methanol as a torch fuel.
- I also do not recommend it from a standpoint of safety. It does eat
- wicks up, also the screws and metal sheathing and then the dowel
- wood underneath.
- But lithium perchlorate, itself, is not terribly unstable. Organic
- perchlorates are -- but they can't be formed just by mixing lithium
- perchlorate and methanol (for example.)
- Methanol, by itself, burns with a pale, wimpy blue flame. With
- the addtion of lithium or sodium perchlorate the flame becomes
- very bright and large. I think tiny deposits of the metal perchlorates
- do form on the wick during burning and explode in sparks.
-
- >
- >A secondary possibility is that as the wick dries, particularly
- >after repeated uses, lithium perchlorate will build up in and on
- >the wick, turning it into explosive.
- >
-
- Could happen, but I think the build-up mainly explodes during a
- burn anyway -- thus no large build-up tends to occur. The real problem
- could be lithium perchlorate seeping into the dowel and perhaps reacting
- over time with the wood.
-
- >All in all, I would *STRONGLY* recommend staying away from
- >perchlorate/fuel mixtures. They've maimed many people over
- >the years.
-
- I basically agree with this. The mention of lithium perchlorate
- should probably be omitted from the FAQ. If you're really that into
- getting the perfect red torch flame (and lithium perchlorate -- while
- hazardous -- is the perfect red) you can find out about it from
- pyrotechnicians or chemists.
- Actually, unless you're a fire artist/technician like Ken, I'm
- pretty sure the colored flame is not worth the trouble. All those
- bottles of fuels mixed with salts to tote around, all the salt-encrusted
- wicks you have to deal with, the smell of solvents in your car and
- apartment, the fretting about whether the methanol fumes are slowly
- blinding you or the combustion products of the metal salts are some
- new, unforeseen carcinogen or chronic exposure toxin, the sight of your
- torches disintegrating and the cost of replacing them, and the guilt
- of borrowing your friends' torches and destroying them as well cannot be
- worth the few seconds of seeing those gorgeous colors. Believe me,
- I've been there.
-
-
- _______________________________________________________________________
- Phillip SanMiguel Purdue
- maize@bilbo.bio.purdue.edu Institute for
- Molecular "We'll do anything
- Bennetzen Lab Plant for funding."
- Science
- _______________________________________________________________________
-