If you want a black blade with gold lettering, you might try painting the blade gold first, and making sure you get the gold into those recesses. Then layer black on, taking care not to get the black in the recesses where you want the gold to shine through. Thin paints are the key there, since you're using at least three layers-- the undercoat, the gold, and then the black itself again. From there, it's just a question of how much highlighting you want to do.