was in chemistry and I had to take 3 semesters of physics as part of that. 
In terms of science & light "color", "black" = the absence of light and "white" is the combination of all of the frequencies of the visible spectrum.
The analogy they mentioned regarding a black hole was due to the fact that black holes (which are really massive suns that have gone super nova and collapsed into themselves) basically have such a high amount of gravitational force that light (wave/particle) cannot "escape" leaving the immediate area with an "absence of (visible) light".
If the visible frequencies are being absorbed and changed to heat (infrared) via those carbon nanotubes, then it would make sense as "slows" the frequencies down but then at some point, it could be detectable -
I understand what is going on with the premise but the pictures at the article literally make it look like they just photoshopped a circle in the picture in front of those people. I think if the people had held a smaller disk then it wouldn't have given the same impression.
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