The Blackest Black

<p><strong>Vantablack</strong> is a material developed by Surrey NanoSystems in the <a title="United Kingdom" href= "https://en.wikipedia.org/wiki/United_Kingdom">United Kingdom</a> and is one of the <a title="Darkness" href= "https://en.wikipedia.org/wiki/Darkness">darkest</a> substances known, <a title="Optical properties of carbon nanotubes" href= "https://en.wikipedia.org/wiki/Optical_properties_of_carbon_nanotubes">absorbing</a> up to 99.965% of visible light (at 663 nm if the light is perpendicular to the material).<sup id="cite_ref-NBCNews_4-0" class="reference"><a href= "https://en.wikipedia.org/wiki/Vantablack#cite_note-NBCNews-4">[4]</a></sup><sup id="cite_ref-5" class="reference"><a href= "https://en.wikipedia.org/wiki/Vantablack#cite_note-5">[5]</a></sup></p>