User blog comment:AYET/Perona's Negative Ghosts vs Shanks' Haki/@comment-3075024-20120205134212

1. Yes, Busoshoku Haki will block Negative Hollow. Consider the haki a invisible armor and Negative Hollow something that is not solid. Still they both has their effect. Haki is said to stop the devil inside DF user's body so no matter solid or not, Haki will have effect.

2. No, Haki may get low for few seconds while Shanks gather back his will power but I think its impossible from the start cause In my opinion if Shanks covers himself in armor of Haki, the negative ghosts won't be able to pass threw Shanks.

Well this is just my opinion and may differ from yours.