I am not giving the answers to all of your
questions, but I hope some of them could be
helpful to you.
Why color black is more absorbent? You first
need to know what is color or color black?
The color is simply the result of reflected
electromagnetic radiation to our eyes. The visible
lights such as red, green, yellow are simply the
electromagnetic radiation that can be seen by our
eyes and they are slightly different in
wavelength. By definition, the color black means
that all of the visible light are mostly absorbed
equally, leaving little visible light reflected to
our eyes. If the material doesn't absorb the
visible light, then it is not black by
definition. The other color, say red, means
that the material will reflect mostly the red
light while absorbing the other visible lights. As
a result, it is less absorbent than black.
solar panel? There are a lot of other
considerations if you are thinking about
substitutes or for solar energy harvesting? If you
only care about the visible light absorption, yes,
then Vantablack is probably good until new
materials show up. But if you are thinking about
everyday application say solar energy harvesting,
then you should ask the questions such as the cost
etc. The Vantablack can absorb the visible
light very effectively, but to convert them into
electricity or heat for our application is another
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