h a l f b a k e r yNo, not that kind of baked.
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The paint in this spray can, when released from the container, immediately oxidizes in the air via an exothermic reaction to (temporarily) produce visible light. The effect eventually fades, as the paint dries invisibly, leaving no trace in daylight, or evermore.
The paint or ink could also be used
in pens for writing (much smaller) ephemeral messages in the dark.
Useful for one-night communiqués, potential nocturnal trysts in back alleys or whatnot.
Chemiluminescence
http://www.lumigen....chemexplained.shtml
Chemical light without heat [nihilo, May 18 2006, last modified May 20 2006]
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Annotation:
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I think you mean Exothermic reaction. The
process would give off both light and heat.
The chemicals would have to mix as they
spray from the can, forcing the reaction. If
they were premixed in the can you'd
obviously have the reaction going on
inside, and the pressure would heighten
the reaction, and spray cans have to be
pressurized anyway. |
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Whoops. I didn't earn a "D" in O Chem for nothin'. |
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But this particular reaction releases energy primarily electromagnetically, rather than thermally. The precise reaction to be utilized remains to be specified. |
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It's not magic. Chemical reactions that produce light and not heat are well known. See link. |
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I prefer "witchcraftiness." |
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//this particular reaction releases energy
primarily electromagneticall// |
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Why? Wouldn't a thermal release be just as
effective, or am I missing your point? |
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Even so, the idea is nice [+]. The spray
could be utilized by motorway/transport/
emergency services as a temporary safety
measure at night. |
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No sense in losing valuable chemical energy through heat. There isn't any need to either; just look at glow worms. |
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And the product would be ideally suited to precisely some sort of motorway/transport utilization. That's probably just one of its many potential uses. |
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temporary glow in the dark grafiti. Cool. i think you could use the same reaction as is used in glow sticks, just mix the chemicals in the spray head and you get a few hours of light. They are already non toxic and i believe non staining, though they may be water soluable which could be good or bad depending on the application. |
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those glowsticks stain, and only pretend to
be non-toxic. they burn when they touch
skin. |
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