cesiumsponge@LoneJedi Birchwood Casey has a product called Brass Black, and it'll darken any copper-bearing alloy. Degrease the part and lightly scrub to remove surface oxides and oils, and experiment! :)
cesiumsponge Ordered this in raw bronze, and I added an a chemically aged patina to darken the faces to a warmer hue and brown the recesses. Beautiful and crisp details!