My opinion is that you are too rich. As some others have stated, that is assuming you have run it "properly" before taking the plug out (loading it appropriately, not an excessive idle,etc.). I road raced 2-stroke motorcycles years ago and I was always looking for a rich golden brown color. Whitish was too lean and a no no headed for a holed piston. Blackish oily was too rich, safe but would be down on power.
i get a few plugs, warm the engine up on one, then put in a fresh one, do a 1-3 minute high speed run, shut it down, and pull/check it.
Lars