Dark brake fluid

[Timbox2]

This has come up on other forums Im sure but here goes.

Ive had the Tiger Sport a week now, and ok Ive put on nigh on 1000 miles, but the brake fluid in the rear brake reservoir has gone really dark and I know it was normal colour when I picked it up as I made a point of looking at it. There seems to be all sorts of theories but just wondered what the TT massive thought?
I even remember this coming up on a BMW forum a couple of years back, same thing, only the rear?

Edit: Seems I might be talking Bo!!0[ks about it being normal a week ago, Ive just checked some photos I took on collection and in fact it looks pretty dark, so, maybe just needs changing, only 8 months old though still, and the front looks the normal p!!s colour??

[SteveFord]

Is the rear brake dragging?

[Timbox2]

Is the rear brake dragging?

3 months ago mate, I changed the fluid and its been fine since