Ultraviolet...

  • Thread starter Thread starter Famine
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Would uv paint make something invisible?


  • Total voters
    49
PS
I know what that is, I just have no idea what Nate was asking.
Oh .. yeah .. I dunno either.
 
the only possible way to paint something ultraviolet would be to create a pigment that was gave off an ultraviolet wavelength (a.k.a. not visible). Thus, unlike the pigments blue, green, or yellow. You would see an object that would be considered "gray material" by most people not a black or a white, and object that took up space but did not reflect light.

Black is the absence of color emission. Usually caused by an object absorbing all of the visible light hits it
.
 
I actually already know the answer, I just felt like messing with a few heads.

There AM such a thing as uv paint - since it's just another colour, or part of the EM Spectrum, all you'd have to do was adjust the pigmentation until it absorbed all but 250nm. Lots of things are already reflective in the 250nm range. And most of them are transparent...
 
Just to go off-topic for a sec.....

Why do you put the "Yes" vote in italics? :confused:
 
On any poll the option you've picked is written in italics after you've picked it, so that you know which option you voted for. THis is a public poll, so that feature is redundant, but it's still there.
 
Oh right. I voted yes, but I don't know why to be honest. Maybe it's because all this talk of uv paint and stuff is scrambling my already cabbaged brain.
zombie.gif


Edit = I should have known that, I've been here long enough. :dunce:
 
If we can't see the UV light and no other colours are reflected then the brain registers that area of sight as black.

Also, for the object to be invisible it would have to have more than just a paint job because for example, if you painted a car UV, then you would also have to paint all the chassis and interior. But then you'd have to replicate the back ground...
 
I've been up for 20-some odd hours, and now I have to think.

Damn you, Famine. You can burn in hell.

(Then again we're both apparently headed there anyway, so ignore me.)
:lol:
 
Boz Mon
the only possible way to paint something ultraviolet would be to create a pigment that was gave off an ultraviolet wavelength (a.k.a. not visible). Thus, unlike the pigments blue, green, or yellow. You would see an object that would be considered "gray material" by most people not a black or a white, and object that took up space but did not reflect light.

Black is the absence of color emission. Usually caused by an object absorbing all of the visible light hits it
.
in order for it to be seen as grey it would have to reflect light that we can see. UV light is light, but as we can't see it it will stay black for us, although for bats, who can perceive UV light, it will be some kind of grey.



Famine
I actually already know the answer, I just felt like messing with a few heads.

There AM such a thing as uv paint - since it's just another colour, or part of the EM Spectrum, all you'd have to do was adjust the pigmentation until it absorbed all but 250nm. Lots of things are already reflective in the 250nm range. And most of them are transparent...
most of them...

but something that is transparent and only reflects UV light can hardly absorb all other light, as you said:
Famine

uv paint - Absorbs all light. Transmits uv photons. Is perceived as...?


PS
This needs some extreme clarification. Famine, TheWizard, anyone?

colour is something that we have invented by ourselves. in reality there are only lightwaves. these lightwaves have no colour, only a certain wavelength.

we see colour, because in our eyes we have three different so called "cones", who are sensitive to three different wavelengths of light. these are the wavelengths of what we call red, green and blue.
our brain then combines the information about how much light of these wavelengths enters our eyes and then creates the sensation of colour for us.



Solid Lifters
I remember a few years back on the news. A Chinese, or Korean, scientist created this new machine that shot out Ultraviolet light, or some other form of light, at your body. Your body would disappear, but it would reflect your bones. I thought it was some new Xray machine he built. He turned it on, and his body disappeared but you could see his bones that were magenta in color. He thought it could be used to as a airport security device. I always thought if he can make the flesh disappear, he could make the bones disappear too. I though this man invented the worlds first cloaking device. But, I never heard about it again.

Does anbody remember this?

Oh, ultraviolet paint means objects disappear.
no it does not mean objekts dissappear...if the story was true, then the scientist was probably dead by now because too much UV light can cause cancer.
but the story is not true, there is no such thing as a cloaking device.

you can built an x-ray and look through something, but only if you use a camera that enables you to view the effect.

the human eye can't see UV light and therefore, even if UV light went straight through the flesh and was only reflected by the bones, we would still see nothing. so this cloaking device would only work in a very dark room, but you don't need a cloaking device if you can't see anything anyway.
 
so just like there is ultraviolet paint...can you paint something with infrared paint and see it? (thats what i was trying to mention above with all the other types of waves)
 
vladimir
colour is something that we have invented by ourselves. in reality there are only lightwaves. these lightwaves have no colour, only a certain wavelength.

we see colour, because in our eyes we have three different so called "cones", who are sensitive to three different wavelengths of light. these are the wavelengths of what we call red, green and blue.
our brain then combines the information about how much light of these wavelengths enters our eyes and then creates the sensation of colour for us.


I know all that, I just didn't (and still don't) have any klue what 17 was referring to! It just konfused the hell out of me with his xray paint and stuff, but he klarified all of that.

[edit]

And no, I'm pretty sure there's no paint that only xrays kan see. There are paints that xrays kan pass through, though, which is most of them. An x-ray "paint" would pretty much have to be a lead plate.
 
:D

I painted it ultraviolet and no-one saw it - except Batboy... Proof! I are the greatest!
 
No... it's a great idea though... but the UV paint itself would be invisible to the human eye, therefore you would see right through it... and you'd see the object as normal...

Glass absorbs UV, but it's a solid object... but since the human eye cannot see UV radiation, glass appears invisible... but just like covering a wall with a sheet of glass, just because the glass is invisible, you'll still see the wall....
 
Isn't it supposed to be glowing violet, a bit like your font colour famine :p
 
#17
so just like there is ultraviolet paint...can you paint something with infrared paint and see it? (thats what i was trying to mention above with all the other types of waves)

Infrared radiation is just heat, so if you stand next to a functioning radiator, it'll 'paint' you infrared. However, you wouldn't be able to see it (without some other equipment like a thermal imaging camera) as human eyes aren't receptive to infrared radiation...if they were, you'd see heat sources as a different colour i.e. a cold kettle could be white, but the same hot kettle could be purple/pink/green...

Some things DO change colour when they get hot (rings on a cooker, wood on a fire), but this is due to black body radiation and not infrared. Even though the hot object is radiating highly in the infrared region of the spectrum, your eyes aren't picking this up. They're picking up the radiation from the visible part of the spectrum. Objects at absolute zero (~273.16 degrees celsius below 0) should/would emit no black body radiation.
 
"Objects at absolute zero (~273.16 degrees celsius below 0) should/would emit no black body radiation."

wait wait...so if i saw an object at absolute zero...it would just be black, or i wouldnt be able to see it?

plus i learned in chemistry that if something reaches absolute zero, that is when the atoms stop moving completely (since the faster the move, the hotter it is, the slower they move, the colder it is) and the matter completely falls apart, being the actual atoms falling individually

or was my chemistry teacher wrong?
 
#17
wait wait...so if i saw an object at absolute zero...it would just be black, or i wouldnt be able to see it?

I reckon matter would be completely transparent, if it were possible to reach absolute zero...
 
vladimir
all light we can see = white. if we can see no light = black.

the colour will reflect just the UV part of light and absorb every other colour, therefore we will conceive the car as being black.

Don't know if it's already mentioned in the thread but I instantly got to think about how that kind of black would look. Something like how the monoliths are described in Clarke's 2001 I guess. That'd be a cool paint.
 
@#17:
Um, according to my physics book (if the translation is correct...):
"...Absolute zero temperatures has defied all attempts to reach it experimentally, although it is very possible to go extremely near it*.
The student must not think in absolute zero as a state of zero energy and absence of movement. The concept that all molecular phenomenom should stop at absolute zero is incorrect. This idea supposes that the purely macroscopic concept of temperature is strictly related to the microscopic concept of molecular movement. When we try to establish this relation, we find that when we are near the absolute zero, the molecules' kinetic energy approaches a finite value, the so called "zero energy point". The molecular energy is minimum, but not zero, in absolute zero."

"*It is possible to prepare systems that have negative Kelvin temperatures. As surprising as this sounds, these temperatures are not reached passing through 0°K but instead, passing through infinite temperatures. [...] The absolute zero remains experimentaly unreachable."
amp88
Objects at absolute zero (~273.16 degrees celsius below 0) should/would emit no black body radiation.
"A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black." (found while looking for black body radiation)
 
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