I've only made 3-4 different juice blends but I've been noticing that when I change the wick in my KFL it's still Lilly White...WTH, now granted I haven't been using any dark flavors, I have used RY4 which turns from clear to golden....but I'm use to seeing my wicks all black, gunky and deteriorated from using store bought juice. Is it just certain dark colored flavors that cause this or some other flavor ingredient.