Carbon nanotubes can create a 'perfect black' that visually wipes out a dimension, making 3D objects look 2D. When draped over a substance, a thin coat of them renders the object invisible by absorbing all the light coming in.
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Carbon Nanotubes are being created that can visually wipe out a dimension and create a 'perfect black'. Minor invisibility may not be a thing of science fiction for much longer. Similar substances are suspected to account for "missing matter" in the universe.