User blog comment:Dettles/Questions about haki/@comment-8823907-20130620114043/@comment-5681812-20130624163633

Boa Hancock lives in an island where almost if not everyone knows about haki and can use it. To be the strongest in such an island also means that her haki is also the strongest. To top it all, she has Conqueror's haki which only one in a million people have. Why, then, haven't we seen an instance where any of her body parts turned black for instance as she was breaking Smoker's staff during the War of the Best? Is this turning-black-thing a special ability for the haki users?