Honestly, I’ve had the light green after taking a vitamin supplement that I did not need. You can get red by drinking a lot of beet juice (the juice in the jar of sliced beets), but if you haven’t done that red is very bad.
No, Autism isn’t caused by vaccines but the risk of vaccines for everyone is not zero. It’s just the amount of people affected are in the .00X% or .000X% range.