Scientists created the world's whitest paint

[Magluvin]

When we have UV sunglasses or UV protection in a clear coat paint, is that UV reflected, or absorbed so it doesnt penetrate.  If it reflects it, then I wonder if there is a way to do the same with IR(heat).  We put tint on our car windows. There is definitely less IR hitting the interior and heating it up. But is it reflected or absorbed? If there were a transparent coating that could reflect IR, then we could have virtually any color, even black, but not collect the heat. If there is such a thing, they surely would be hiding it.  Just a thought as IR and UV are invisible to the eye. Maybe the material that could reflect IR, may not be visible as to such either.


https://www.usatoday.com/story/news/nation/2021/09/17/whitest-paint-created-global-warming/8378579002/


Mags

[Smudge]

I had some dealings with IR imaging in the Company I worked for (that was quite a while ago, I have been retired for 22 years).  The best white paint (using an Al oxide if I remember correctly) actually looked black at long-wavelength IR (30 microns).  Even snow looks black.  The Sun's heating that can approach 1KW per square meter is at those long wavelengths.  What these guys have achieved is a wide bandwidth reflective paint.  I think the UV coatings on sunglasses are not wide band, they are frequency selective where the frequency is determined by the thickness of the coating, just like RF transmission line tuning stubs where the frequency is determined by the length of the stub.

Smudge   

[Magluvin]

Funny..  I have red lasers, ir lasers, green laser and blue.  All of them can burn things.  Even UV lasers can burn.  So I guess IR heat is what is emitted by materials that are hot, or say at a higher temp than its surroundings.

Mags

[Allcanadian]

I thought this was really weird...https://www.youtube.com/watch?v=8sDGSgcSZJA,
Musou Black—The (New) World's Blackest Paint Turns Anything Into A Shadow

Regards
AC