The difference between the black sign and the blue sign of Blue Ocean Building.
There is no difference. The difference between gold label and black label of clothes and white label and blue label: the labels have different colors and have no specific meaning. It's just a clothing trademark, and the clothing factory company thinks this color suits it. "Blue Ocean House" (abbreviated as HLA) is a clothing brand under Blue Ocean House Co., Ltd., which mainly sells men's wear, accessories and related products in chain retail mode.