Why does Luffy's hand turn black after using his Haki in One Piece?Why does Luffy's hand turn black after using his Haki in One Piece?

Why does Luffy's hand turn black after using his Haki in One Piece?

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One of the most unique and creative aspects of One Piece is the implementation of Haki post-time-skip.One of the most unique and creative aspects of One Piece is the implementation of Haki post-time-skip.
One of the most unique and creative aspects of One Piece is the implementation of Haki post-time-skip.
One Piece fans, however, have been confused on exactly why the use of Haki, specifically Armament Haki, will turn the objects or limbs imbued with it a blackish-purple color.
One Piece’s Haki has fans questioning the physical changes that occur after use
Alongside this praise, however, have come many questions about Haki and its three subdivisions. Some fans question why Luffy's limbs, and others, turn into the trademark blackish-purple hue of Armament Haki after using it.
The answer is simple and likely far from what fans were expecting upon searching for an answer to the question.
Author Koyoharu Gotouge has also said that these stylizations are invisible to characters and serve as essentially fanservice. However, Armament Haki’s color change is unfortunately meant for their viewing experience only.
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