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Before the time skip, characters like Garp and the Priest of Sky Island, used
Haki to deal damage to Luffy via a blunt attack, which would have been
impossible otherwise. Also, Haki was used by both sides during the Summit War.
None of these people turned black.

But after the time skip, when Luffy used Haki against Hordy, he partially
turned black. And during his fight with Z, they both turned partially black.
Is this a special type of Haki? Is there any reason why they change colors and
if so why black?


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2013-10-07T17:25:20.057
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one-piece
Why does the use of Haki turn part of your body black?


The physical strength attribute of haki works as an "invisible armor" called
[Busoshoku Haki](http://onepiece.wikia.com/wiki/Haki/Busoshoku_Haki). The
raise in density & thus, black coloring of a body part is in this haki
category called **Busoshoku: Koka**. The sky priests aren't listed as users of
either forms of this haki, but they did demonstrate haki abilities such as
[Kenbunshoku Haki](http://onepiece.wikia.com/wiki/Haki/Kenbunshoku_Haki) which
they called Mantra.

So yes, it is a special type of haki.

But reasons for not using it pre-timeskip span from it not being a fleshed out
idea yet to something saved for the new world or it's just a serious assault
that people inexperienced can't reach without proper training (since Enel
never had too many challenges to increase his potential) to people who could
do it were just holding back (because Garp wanted to raise Luffy... not kill
him).


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2013-10-07T20:12:10.850
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Luffy's Haki ability is called Busoshoku: Koka. Koka means hardening. Luffy's
body is made of rubber. Oda is quite clearly referring to hardened rubber, or
vulcanized rubber, which is black. (Compare images below)

![Luffy's hardened arm](https://i.stack.imgur.com/C6LIL.png) ![Vulcanized
rubber](https://i.stack.imgur.com/dATiX.jpg)


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2013-11-04T08:35:03.820
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It depends on how dense the haki (invisible armor) they use. When garp use
haki to hurt luffy, he applied just a small amount so that it doesn't really
hurt or can cause serious injury. That explains alot right? When you applied a
vast amount of haki on your body .. it will turn black.. because of the
density of the haki you applied on it. if it is a small amount.. then it's
like invisible..


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2014-01-12T06:54:30.183
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In the pre-timeskip, use of Busoshoku Haki as "invisible armor" was shown as a
swift percussion forming a light-blue beam, similar to lightning, while in the
manga, it is shown simply as an amplified impact, nothing else visible is
shown... from wiki :v


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2014-08-14T06:08:30.490
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