The black color in confusing. Why did Luffy need to summon (?) a bucket with black color and a brush if he could have used armament Haki to achieve the same color? Or is the black color color of armament? Also up until know Gear 5 only summoned white things if I remember correctly (white hair, clothes, rubberband, surroundings, glasses). Isnt black color supposed to be Blackbeards thing?

I want to know the lore behind this lmao, I have to much fantasy to explain those things with different (maybe wrong) explanations. And maybe there will be no official reasoning behind this color bucket at all …