I have never been obsessed with any color, but it doesn't sound that unusual since aspires can get obsessed with pretty much anything it seems. (I have a favorite alphabet -lol)
I liked red and any other bright color when I was a kid. I liked blue as a teenager. Now my favorite color is green. It is a very calming, earthy color, not too peppy or too somber.
_________________
Your Aspie score: 120 of 200 ; Your neurotypical (non-autistic) score: 90 of 200
You seem to have both Aspie and neurotypical traits
Self-DX: Extreme Introvert, possibly with ADHD-Primarily Inattentive; Official DX: Generalized Anxiety Disorder