Blackest black v. pinkest pink: Can you own a color?

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Vantablack is allegedly the blackest black that exists. It was originally only used for aerospace technology, until Anish Kapoor got exclusive rights to use it in art. No one else could get their hands on it. British artist Stuart Semple decided to fight back by creating his own color -- the pinkest pink -- and banning Kapoor from buying it.