It used to be his favorite color. As a kid it was his favorite crayon to color with. He loved cherry jello and strawberry iced cream. He remembered making big red craft paper hearts for his mother on Valentine's Day as a kid. At Christmas time it was the color of Santa Claus.
Then he joined the police force and became a crime scene investigator. Now that color held a different place in his life, a different significance. It was the color of blood. He still enjoyed all of those things from his childhood but red wasn't his favorite anymore.