This is Vantablack, and it’s the world’s darkest material. It is manufactured from tiny carbon nanotubes and can absorb up to 99.96 percent of the light that contacts it. It’s in a coating so black that spectrometers can’t measure it! Even running a high power laser pointer across it bearly reflects anything back to the viewer.
Vantablack is primarily used for military and astronautical purposes. For example, it has been used in telescopes to absorb extra light, which allows the viewer to see further into space. Here you can get an even better idea of just how dark it is: