11–20 of 271 posts
I'm not sure about the suggestion that people are going to paint their roofs with it. People already have the opportunity to paint their roofs with cheap white paint which would provide nearly all the benefits this would, and still choose not to do it.
I wonder how well this holds up to dust, pollen, UV, etc. At some point is the difference negligible? Every white commercial roof I've ever seen is much less white after some time passes.
How does black paint work anyway? What happens to the energy of the photons? (Will google, but perhaps someone here can explain?)
Can someone explain the difference between this and a mirror? A mirror reflects also something like 98%, right?
I assume this could be useful to shield something in space with extremely specific temperature tolerances. I'm not sure about the suggestion that people are going to paint their roofs with it. People already have the opportunity to paint their roofs with cheap white paint which would provide nearly all the benefits this would, and still choose not to do it.
> Commercially available white paints reflect between 80% and 90% of sunlight, according to lead researcher Prof Xiulin Ruan from Purdue, in West Lafayette, Indiana. "It's a big deal, because every 1% of reflectance you get translates to 10 watts per metre squared less heat from the Sun," he explained.
Also: Black 3.0, the purchasable variant of Vantablack For sale at: https://www.culturehustleusa.com/
Can someone explain the difference between this and a mirror? A mirror reflects also something like 98%, right?
Can someone explain the difference between this and a mirror? A mirror reflects also something like 98%, right?
https://en.wikipedia.org/wiki/Specular_reflection
Paint reflects primarily with diffuse reflection. The rays of light are scattered in all directions:
I wonder how well this holds up to dust, pollen, UV, etc. At some point is the difference negligible? Every white commercial roof I've ever seen is much less white after some time passes.