If you’re wondering why this substance is not available to Anish Kapoor, from Wikipedia: In 2014 Kapoor began working with Vantablack, a substance thought to b

If you’re wondering why this substance is not available to Anish Kapoor, from Wikipedia: In 2014 Kapoor began working with Vantablack, a substance thought to be one of the least reflective substances known. Vantablack S-VIS, a sprayable paint which uses randomly-aligned carbon nanotubes and only has high absorption in the visible light band, also called the "blackest black" colour, has been exclusively licensed to Anish Kapoor's studio for artistic use.[63] His exclusive licence to the material has been criticized in the art world, but he has defended the agreement, saying: "Why exclusive? Because it's a collaboration, because I am wanting to push them to a certain use for it. I've collaborated with people who make things out of stainless steel for years and that's exclusive."[64] Artists like Christian Furr and Stuart Semple have criticised Kapoor for what they perceive as an appropriation of a unique material, to the exclusion of others.[65][66] In retaliation, Semple developed a pigment called the "pinkest pink" and specifically made it available to everyone, except Anish Kapoor and anyone affiliated with him.[67][68] He later stated that the move was itself intended as something like performance art and that he did not anticipate the amount of attention it received.[69] In December 2016, Kapoor posted an Image on Instagram of his extended middle finger which had been dipped in Semple's pink.[70] Semple developed more products such as "Black 2.0" and "Black 3.0", which has similar qualities to Vantablack despite being acrylic, and "Diamond Dust," an extremely reflective glitter made of glass shards, all of which were released with the same restriction against Kapoor as the "pinkest pink".[71][72]