i did one of mine, from a thread i found on gmfs, i think. take bowtie off, heat up bowtie, (either w/ heat gun or hair dryer) heat it good, slowly try to peel it apart. Keep heat on it, it will break. Mine did, not hot enough. When apart, you will see the "gold" part clear on one side, use oven cleaner and spray on the gold side. Let sit for awhile, wipe off. Clean it good. If not, use O.C. again and get all gold off. It will show up. Then scuff it, i used green pad, just for paint to adhere to. Then paint it. When done, get 3m adhesive, or some good adhesive and spray on the other part of the emblem. Not the part you just painted. Then stick the two halves together. Clamp them if you like.
But this is what i did and works fine. B/c then you dont have to worry about the chipping thats on all bowties. Most reason paint comes off. But the only bad thing is if yours is already chipped, then its going to show up. But since your wanting black you might be alright, unless you want it perfect. Mine is flat black and looks good to me and mine is chipped a little.