Sam, take a look at the DNW medal auction website. There are photos of naming on there, but they are also quite meticulous in how they describe the naming of medals that don't have a photo; Abbreviations, dashes etc are all exactly as they appear on the rim. You will notice that there are a variety of naming styles, depths of stamping, engraving and all sorts of variations. Those of us with several AZW medals in our collections will probably agree that even those to the same unit will have minor variations in the detail of the naming and how well the medal was struck up at the mint(s). No two are ever the same.
For the blackening,I remember reading somewhere that the black colour is carbon dust or soot, usually mixed up in a paste with wax or some other hydrocarbon/oil based base and then rubbed in.