Colors

[Mille]

Ok i have a simple question about colors.
Why the sum of all frequencies (colors) in light make white, and in chemical paint make black?

 

[FrothyChimp]

Paint works by absorbing colors and reflecting only specific wavelengths. Add enough colors together and you get something that absorbs most of the wavelengths. Light is not absorptive. Each wavelength impacting the cones of your eyes stimulates the transmission of that color. Add a bunch of wavelengths across the spectrum and it begins to look white because the combination is additive.

 

[jamilm9]

Paint works by absorbing colors and reflecting only specific wavelengths. Add enough colors together and you get something that absorbs most of the wavelengths. Light is not absorptive. Each wavelength impacting the cones of your eyes stimulates the transmission of that color. Add a bunch of wavelengths across the spectrum and it begins to look white because the combination is additive.

to prove this take a blue light and shine it at a banana.It will turn black.

 

[diachi]

Or take a yellow light and shine it on something blue.

 

[Ace82]

Or take a red, green and blue laser and make white.

 

[jamilm9]

Or take a red, green and blue laser and make white.

then when your done give it to me

 

[Ace82]

[quote author=Ace82 link=1222373792/0#4 date=1222468502]Or take a red, green and blue laser and make white.

then when your done give it to me[/quote]

Poof, it's your avatar! Nice fiber optic too!

 

[jamilm9]

[quote author=jamilm9 link=1222373792/0#5 date=1222469452][quote author=Ace82 link=1222373792/0#4 date=1222468502]Or take a red, green and blue laser and make white.

then when your done give it to me[/quote]

Poof, it's your avatar! Nice fiber optic too! [/quote]
i know its beautiful.

 

[Switch]

I doubt a banana is going to turn black in presence of blue light, it's still gonna continue to reflect the yellow from the daylight ;D

Btw, I think that's a gas laser , lasing at multiple lines, not RGB combined.

 

[jamilm9]

yeah I'm guessing its a argon/krypton and you have to do the banana in the dark

 

[Deleted member 8178]

If you shine a blue light on something yellow, it will still be blue, only weaker.

Unless it floressence, like shine a blue (473nm) laser in a white LED (its yellow inside) and you'll get a white-ish colour.

 

[ArRaY]

If you shine a blue light on something yellow, it will still be blue, only weaker.

Unless it floressence, like shine a blue (473nm) laser in a white LED (its yellow inside) and you'll get a white-ish colour.

That is the way a white led works...
Basicly it is a blue led with a layer of a yellow colored phospor, which converts parts of the blue light to yellow, and the yellow and blue give you white.

ArRaY

 

[ArRaY]

I doubt a banana is going to turn black in presence of blue light, it's still gonna continue to reflect the yellow from the daylight ;D

Btw, I think that's a gas laser , lasing at multiple lines, not RGB combined.

That is something you call a 'supercontinuum laser', this beauty kicks out the entire visible spectrum...
It is some kind of special fibre laser... a photonic crystal fiber is used to achieve this.
It works the same way as a green laser for example, where a nonlinear optical crystal is pumped to get green.
Because of the nonlinear property of the fiber, it generates different wavelengths over a certain range, mainly the visible spectrum.

It is like every laserist´s wet dream ;D

/me

 

[thesk8nmidget]

it is my wet dream! i dream of that converted to a back pack and the output is my weapon of choice!

 

[ArRaY]

That´d be very sweet... Wait a few years.

 

[Deleted member 8178]

[quote author=FireMyLaser link=1222373792/0#10 date=1222719640]If you shine a blue light on something yellow, it will still be blue, only weaker.

Unless it floressence, like shine a blue (473nm) laser in a white LED (its yellow inside) and you'll get a white-ish colour.

That is the way a white led works...
Basicly it is a blue led with a layer of a yellow colored phospor, which converts parts of the blue light to yellow, and the yellow and blue give you white.

ArRaY[/quote]
LOL don't you think I knew that? Lol you're silly... you're silly. ;D ;D