The law is definitely not dead in One Piece. It exists in various forms and degrees, and its enforcement or violation drives many of the story arcs. The struggle against injustice and the search for true justice are ongoing themes related to the law within the manga.
Not at all. Law remains a significant character and has many ongoing plotlines associated with him. His presence continues to shape the events in the One Piece manga.
The One Piece manga is not in color. It's presented in black and white, which allows for greater focus on the linework and details of the illustrations. Colorized versions might exist in some limited cases, but the majority of the manga is black and white.
The One Piece manga has gone on hiatus in the past. This could be for various reasons like ensuring the quality of the story or taking a break to recharge creativity.