I've got a black leather Galls 1911 Mag pouch that I occasionally use for P220 mags. The thing was that the rubbery black coating they put on it quickly peeled off and it looks crappy. If you want a black dyed leather mag pouch that will look good and last, my advice is buy a top dollar product from a reputable maker.
My normal EDC mag pouch is a modified Vietnam era 1911 mag pouch which I tore out the inner seam from so it would fit sideways on my gun belt. I am very happy with that system.