from my experience . . . my fondant has gotten sticky on me as well when I’m trying to get a dark color. I think it’s normal, especially if you’re using a gel color. Between adding the color (which adds moisture) and using your hands to work the color in (your hands are warm, therefore your adding additional heat). Added to all that, if there’s heat or humidity in your climate, you’re going to get a sticky fondant. I tend to rub some shortening on my hands (or gloves, which I now wear to keep my hands from getting overly saturated in color). That seems to keep the fondant from sticking to my hands. When trying to achieve a really dark color (like a navy blue) I tend to work in stages to allow the fondant to rest.