That would depend upon your location in the world. There are qualified people in the EU, Canada, and the US .. I'm sure there are others I'm not aware of. There is a high quality black lume made and I'm sure it's just what you are looking for.
Kent Parks, Vacuum, and Zigmeister are all in North America. Domenico and others are high quality modders in the EU.
Funny thing is, I think I was looking at a photo of a black-lumed watch just today .. Look Here