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Dumbass kkkanadian$$ don't know how light works. (hexbear.net)
submitted 2 years ago by to c/chapotraphouse@hexbear.net
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[–] 59 points 2 years ago* (20 children)

You see the light reflecting from paint doesn't actually become blue, it loses yellow nerd

so if i put spectrophotometer, it won't show spike at 460 nm?

well, yes, it would nerd

fucking nerds

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  • [–] 67 points 2 years ago (5 children)

    This isn't that pedantic paint shit. The tweet did a bad job of explaining

    Blue Jays are blue because of structural coloration rather than pigmentation, like how peacock tails or butterfly wings work. While the actual pigmentation on a Blue Jay's wings is brown, the light bending caused by the tiny structures within their feathers makes them blue. Pretty neat!

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  • [–] 35 points 2 years ago* (last edited 2 years ago) (3 children)

    The end result is still the same, the neat interference aside, they are "really blue". The starting point of the tweet they are not and it is nerd shit.

    The neat interference can be brought up by like comparisons to: gas spills on water, butterflies, tempered steel, dslr lenses, *opals!

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  • [–] 27 points 2 years ago (2 children)

    Yeah bad tweet for sure, I just think structural colour is very cool.

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  • [–] 13 points 2 years ago

    It's light scattering rather than "bending", which is not bending but rather refraction due to the differences of the speed of light within the feathers compared to outside the feathers in the air.

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  • [–] [S] 45 points 2 years ago* (3 children)

    when I'm at a pedantic nerd competition and my opponent pulls out a spectrophotometer

    tails-startled

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  • [–] 15 points 2 years ago (9 children)

    a UV-vis spectrum of the pigment in their feathers should look like this and the observed light is from scattering instead of absorption processes. god fuck please wedgie me

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  • [–] 12 points 2 years ago* (8 children)

    yeah, but instead feathers look like this, also known as "really blue"

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  • [–] 16 points 2 years ago (7 children)

    pedantic shit but since im shrivelling into a corn cob: reflectance spectroscopy on a bulk structure that reflects blue shows that it indeed reflects blue, not that the material comprising the structure itself transmits blue as with pigments

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  • [–] 15 points 2 years ago (6 children)

    rage-cry <- this is me rn.

    Pigments (typically used in non transparent dyes) don't transmit, they subtract parts of white light, and reflect what we call their color. Indigo does exact same shit - indeed reflect blue(tm).

    its not "an optical illusion"

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  • [–] 12 points 2 years ago (3 children)

    shit fair shout had internal transmittance and absorption mixed up. and yeah it's not an optical illusion, it's still reflecting blue light, just not as a direct result of electronic effects

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