this post was submitted on 29 Jan 2024
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chapotraphouse
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fucking nerds
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!
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!
Yeah bad tweet for sure, I just think structural colour is very cool.
Blue jays aren't blue
Blue jays are like opals
Adam Sandler peering at a Blue Jay with a magnifying glass
"Holy shit I'm gonna cum"
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.
when I'm at a pedantic nerd competition and my opponent pulls out a spectrophotometer
You came at me talking about objective facts without scientific instruments? Think better, kiddo
*spectrometer
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
yeah, but instead feathers look like this, also known as "really blue"
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
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"
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
We can be two corncobs together in the field
ok but im still dying mad
Shut up and kiss already, nerds!
"transmission" is analogous to transparency, right?
Yes