It was red to start with and likely changed to green along the way. I'd just drain it, flush and refill with green. I have red in mine but don't have a strong reason to use one or the other except that changing from one to the other should involve a through flush to keep the two from mixing.
'03 KTM 450EXC
"If you know what you're doing, then you aren't learning anything." - A. Lincoln