Surrey NanoSystems is famous for creating Vantablack, a material so black that it absorbs all but 0.035 percent of visible light. That?s a lot. Things basically disappear when coated with the Vantablack carbon nanotubes. And yet, they?ve somehow made the material even blacker. Yes, the blackest black material has become even blacker.
Can't see the light from a laser pointer reflect from it.