About his daughter Blue Ivy Carter. This is not the first song he’s written about her. Note also that “Jay-Z Blue” is indeed a real color that Hov tried to trademark back in 2002. True to form, it was flaked with platinum. That’s in emulation of artist Yves Klein and his patented IKB (International Klein Blue), designed by the artist to illicit strong emotion, and notoriously difficult to reproduce on a computer monitor. Jay has even mentioned in song his infatuation with the color, on Young Jeezy’s “Go Crazy (Remix)”:

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