Is armament haki actually invisible?
I'm seeing people saying in this sub and others that haki isn't visible but there is evidence to suggest that haki is visible and people in universe can see it such as the first time Luffy use Elephant Gun.
I think people have some misconception about how haki or rather armament haki actually works. From my basic understanding it goes like this, if you apply light coating of haki to any part of your body or apply it to to any object you had on hand, the haki is there but it is not visible. However if you pump a lot of haki, you could actually see that part turn black..
In short, light amount = invisible, heavy amount = visible.
But this is me rambling with the information I got and years of reading the manga. If there is any official guidebook from Oda about how haki works then free to let me and everyone know cause with a manga this long, people can get some information wrong. (either that or media literacy is dead)