NASA developed the worlds blackest black (that's an interesting story in itself) but they gave the rights to "Anish Kapoor" who was the only artist that could use it.
So in protest, the person who came up with the worlds pinkest pink has banned Anish Kapoor from using it. You even have to sign a legal document saying you won't give it to him.
https://www.dezeen.com/2016/12/30/anish-kapoor-uses-stuart-semple-worlds-pinkest-pink-despite-ban/