Half a croissant, on a plate, with a sign in front of it saying '50c'
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VantaBlue

Like VantaBlack except it's blue
  (+2, -1)
(+2, -1)
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Nanoscale textured surface except instead of being carbon nanotube "whiskers" (black) the "whiskers" are lazurite crystals (blue).
sninctown, Mar 27 2020

"Structural color" paint http://physicsbuzz....uld-create.html?m=1
[xaviergisz, Mar 28 2020]

The Bridge of Death https://m.youtube.com/watch?v=Wpx6XnankZ8
The first two questions are easy. [8th of 7, Mar 28 2020]

[link]






       What [bigsleep] said.
pertinax, Mar 28 2020
  

       We need a VANTA Black Man Group.
RayfordSteele, Mar 28 2020
  

       Why blue, not red?
Mindey, Mar 28 2020
  

       Because you don't want to be hurled to your doom from the Bridge of Death, presumably...   

       <link>
8th of 7, Mar 28 2020
  

       That's an expensive Fanta. Mixgeology.
wjt, Mar 29 2020
  

       [+] 'cuz the name's cute, but horrible science : if you had a "vanta" nano-structure, it'd be black, that's what it does.
FlyingToaster, Mar 30 2020
  

       Could plasmonics make a bluer blue than diffraction, or a blue photovoltaic power minute LEDS or lasers
beanangel, Mar 30 2020
  

       ^ Intricately complex structure that converts all* forms of energy to a specific band of blue? The needed blue. Some out of solar system minerals may be a requirement.   

       *most
wjt, Mar 31 2020
  

       Due to the inherent inefficiencies of photovoltaics, an absorptive - re-emissive system is always going to be less efficient than simple reflection of desired wavelengths.   

       Reflecting only desired wavelengths, but also absorbing all other undesired incident energy and re-emitting on that desired wavelength will indeed produce a "brighter" colour.
8th of 7, Mar 31 2020
  
      
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