I think "Sin city" is a very cool movie. The narrative of it is interesting and quite unique compare to other Hollywood movie (I feel like watching an animated comic when I watch it the first time). However, the use of color of this movie is the element that makes the deepest impression on me.

The movie is almost black & white. The color character/object play an important role in the narrative. In this images, the color reveal to character a sicko-psycho villain.

The introduction of this movie make an reference to its original story. it tell the audience that this movie is a remediation of the comic series "Sin city". I think the color role in the introduction is to tell audience that this movie is a freaking violence one.