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- Path: sparky!uunet!gatech!destroyer!ncar!csn!copper!aspen.craycos.com!rh
- From: rh@craycos.com (Robert Herndon)
- Newsgroups: rec.juggling
- Subject: Re: Coloured Flames - FAQ answer
- Message-ID: <1993Jan26.124804.14871@craycos.com>
- Date: 26 Jan 93 12:48:04 GMT
- Organization: Cray Computer Corporation
- Lines: 52
-
- maize@bilbo.bio.purdue.edu (Phillip SanMiguel) writes:
-
- >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.
-
- My concern here is not organic perchlorates being formed.
- Perchlorate and any fuel (e.g., sodium perchlorate, potassium
- perchlorate, or lithium perchlorate, and aluminum or charcoal or
- sulfur or antimony trisulfide, ...) in a simple mechanical mixture
- is usually explosive. A very scary scenario for me is seeing some
- juggler, unacquainted with perchlorates, dumping an ounce or so
- into a bottle of methanol, stirring with a torch head, and having
- the mixture go up. It does not seem improbable that the result
- would be glass shrapnel and a large cloud of dispersed methanol,
- which might then ignite to form a large fireball. Not someplace
- I want to be... Nor do I want this to happen to anyone.
-
- Methanol alone, due to its high vapor pressure and low flash
- point, has caused many accidental lab fires/explosions and fatalities
- due to accidental ignition. Mixing it with a powerful oxidizer,
- without careful observation of safety procedures, thorough knowledge
- of quantities and ratios, and a careful review of the pyrotechnics
- literature, strikes me as exceptionally dangerous.
-
- Mixing perchlorates with fuel for fireworks is a procedure done
- very cautiously, and in small quantities. It should never be done
- in a glass or metal container, and should not be done without full
- face protection, heavy clothing, and gloves. Strong oxidizers, and
- perchlorates are among the strongest, should not be handled casually
- or lightly. Whether we intend to make fireworks or not, we should
- be no less cautious with mixtures as powerful and potentially as
- dangerous.
-
- Robert Herndon
-