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wolfbane
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 Posted: Tue Aug 12, 2003 2:49 am Post subject: glow paint / powder ? |
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Has anyone here tried to make glowing powder? Is it possible to make
this kind of stuff using non radioactive materials without extensive
equipment? |
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wolfbane
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| Posted: Wed Aug 13, 2003 2:48 am Post subject: Re: glow paint / powder ? |
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Steve Turner wrote:
Using a recipe from an older book I got absolutely no results whatsover
using my oven (the temperature required was not given for some reason).
I put in calcium oxide with sulfur and some bismuth, sodium chloride and
potassium chloride.
Don>t remember exactly but the end product seems like the same sort of
material you describe. Anyway, the sulfur burned away when I heated it
in a metal container over open flame.
[quote]wolfbane <mindless@paalhuis.org> wrote:
Has anyone here tried to make glowing powder? Is it possible to make
this kind of stuff using non radioactive materials without extensive
equipment?
Phosphorescent paint is usually based on "luminous calcium sulfide."
This can be made at home, but it requires very high temperatures. It
might be an interesting experiment if you have access to a ceramics
kiln. The chemistry is typically based on high temperature reduction
of calcium sulfate with carbon. Trace amounts of dopants (e.g.
manganese salts) must be used, and the starting materials must be very
pure.
Try doing web searches on "phosphorescent paint" and "luminous calcium
sulfide" and combinations thereof.
Steve Turner
Real address contains worldnet instead of spamnet[/quote] |
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Steve Turner
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| Posted: Wed Aug 13, 2003 4:09 am Post subject: Re: glow paint / powder ? |
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wolfbane <mindless@paalhuis.org> wrote:
[quote]Using a recipe from an older book I got absolutely no results whatsover
using my oven (the temperature required was not given for some reason).
I put in calcium oxide with sulfur and some bismuth, sodium chloride and
potassium chloride.
Don>t remember exactly but the end product seems like the same sort of
material you describe. Anyway, the sulfur burned away when I heated it
in a metal container over open flame.
[/quote]
The procedure you described sounds like the one of the ones I>ve seen
for making phosphorescent CaS. I have had only modest success doing
this. It is a touchy process. The starting materials, as I
mentioned, must be very pure, and the amount of dopant fairly precise.
You also need very high temperatures to do this, far above what
ordinary ovens will achieve. We>re talking orange hot. A muffle
furnace should do the trick, as should a ceramics kiln.
Steve Turner
Real address contains worldnet instead of spamnet |
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Terry Wilder
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| Posted: Mon Aug 18, 2003 10:11 am Post subject: Re: glow paint / powder ? |
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"Steve Turner" <srturner1@spamnet.att.net> wrote in message
news:gatijv8kbmcq11c58i3cn6hjfa61k57h39@4ax.com...
[quote]wolfbane <mindless@paalhuis.org> wrote:
Using a recipe from an older book I got absolutely no results whatsover
using my oven (the temperature required was not given for some reason).
I put in calcium oxide with sulfur and some bismuth, sodium chloride and
potassium chloride.
Don>t remember exactly but the end product seems like the same sort of
material you describe. Anyway, the sulfur burned away when I heated it
in a metal container over open flame.
The procedure you described sounds like the one of the ones I>ve seen
for making phosphorescent CaS. I have had only modest success doing
this. It is a touchy process. The starting materials, as I
mentioned, must be very pure, and the amount of dopant fairly precise.
You also need very high temperatures to do this, far above what
ordinary ovens will achieve. We>re talking orange hot. A muffle
furnace should do the trick, as should a ceramics kiln.
Steve Turner
Real address contains worldnet instead of spamnet
[/quote]
One of the chapters in one edition of Henleys Formularies was devoted
especially to this. |
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Cory B
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| Posted: Mon Aug 18, 2003 1:10 pm Post subject: Re: glow paint / powder ? |
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wolfbane <mindless@paalhuis.org> wrote in message news:<bh92m1$9h$1@ares.cs.utwente.nl>...
[quote]Has anyone here tried to make glowing powder? Is it possible to make
this kind of stuff using non radioactive materials without extensive
equipment?
[/quote]
Well, I>ve never made it but http://www.unitednuclear.com sells some
really nice phosphorescent powder, it>s supposed to glow for 12 hours
after exposure to light..
A question for everyone here, does anyone have an idea as to why when
I point my laser at a glow in the dark anything I get a dark spot
where my laser hits and a glow around that area? Interesting to say
the least really, it>s quite counter-intuitive.. |
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Mark Thorson
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| Posted: Mon Aug 18, 2003 7:46 pm Post subject: Re: glow paint / powder ? |
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Cory B wrote:
[quote]A question for everyone here, does anyone have an idea as to why when
I point my laser at a glow in the dark anything I get a dark spot
where my laser hits and a glow around that area? Interesting to say
the least really, it>s quite counter-intuitive..
[/quote]
There are electrons trapped above their ground state
by dopants in the material. The light from your laser
adds enough energy to promote them to an energy
level from which they decay all the way to ground.
Without the energy input, they will spontaneously
decay to ground anyway, with the emission of light. |
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